Unintentional weight loss can occur because of an inadequately nutritious diet relative to a person's energy needs (generally called malnutrition). Disease processes, changes in metabolism, hormonal changes, medications or other treatments, disease- or treatment-related dietary changes, or reduced appetite associated with a disease or treatment can also cause unintentional weight loss.[26][27][28][32][33][34] Poor nutrient utilization can lead to weight loss, and can be caused by fistulae in the gastrointestinal tract, diarrhea, drug-nutrient interaction, enzyme depletion and muscle atrophy.[28]

I'm more toned and I can pull my skin away from my muscle (whereas before it was fat). I love that I DO workout hard, but it's not the kind of hard that I used to do, where you work out until you want to throw up, or can't sit down for 2 days because you're so sore. I couldn't do that in this stage of life so this program really works for me. I was able to jog (and I HATE running) the other day, because I had the energy and the muscle strength to support that kind of movement. The only negative thing about this program is that I have to buy a ton of new clothes!! :-)


I am so thrilled with this entire program. I have loved learning how to track macros, carb cycle, fast, workout efficiently and effectively, and make intentional choices with my food so that I could hit my goals and still have the flexibility to enjoy my birthday weekend festivities, lots of dinners out with friends and family, and my favorite foods from time to time. I am also so surprised at how much I have enjoyed the workouts in the program. I have never incorporated weight-lifting in my exercise routine and I am LOVING it! I haven’t missed a single workout in six weeks, and I can’t believe how quickly I have seen significant changes in my body (hello, biceps!!!!!). 
If you feel like any extra calories you eat go straight to your belly or thighs, you're not imagining things. Those are usually the areas where you store fat because of your genes, hormones, age, lifestyle, and other factors. Your body tends to hoard calories as fat to keep you alive and safe. The challenge is learning how to get rid of that extra fat.
Your body needs a certain amount of essential vitamins and minerals to function properly. What happens when you don’t get enough of them? What happens when you eat too little food, or when the food you eat isn’t sufficiently nutritious? Perhaps our bodies catch on and reply by increasing hunger levels. After all – if we eat more, we increase the chances of consuming enough of whatever nutrient we are lacking.
When you start reducing your calories to create a healthy calorie deficit, you may start to feel hungry as you adjust to your new calorie intake. You don't want to ignore physical cues of hunger such as dizziness, headaches, the inability to concentrate, and extreme fatigue, but one of the reasons people struggle to lose weight is because they don't eat satiating meals and instead allow themselves to feel hungry all day. This isn't sustainable and such restriction often ends in binge-eating or giving up.
The 2003 research indicated that exercise is a top weapon against visceral fat, backed up by a 2011 study which found that aerobic exercise is basically a magic bullet. Aerobic exercise is known to most people as cardio — activities such as running and cycling, as opposed to resistance training (where you lift heavy stuff around). While participants in the study worked fairly hard (jogging 20km per week at a high intensity), the researchers said lower-intensity but longer workouts should have similar benefits.
Not in an extreme, Atkins sort of way, but having a little protein at every meal fires up your metabolism. "Your digestive system uses more energy to break it down, so you burn more calories," explains Lisa Dorfman, R.D. However, keep protein levels to between 20 and 35 percent of your diet; eating too much of it can cause kidney strain and may cause your body to store too much fat.
Cortisone as an oral drug is another common culprit (e.g. Prednisolone). Cortisone often causes weight gain in the long run, especially at higher doses (e.g. more than 5 mg Prednisolone per day). Unfortunately, cortisone is often an essential medication for those who are prescribed it, but the dose should be adjusted frequently so you don’t take more than you need. Asthma inhalers and other local cortisone treatments, like creams or nose sprays, hardly affect weight.
If you get enough protein and fat, your total calorie intake should take care of itself. Because you feel full, you won't binge on a can of Pringles and blow your calorie count for the day. The remaining 45 percent of calories in our plan comes from carbohydrates — enough to give your palate a full range of tastes and your body a combination of fast- and slow-burning fuel.
Women who wake up and go to bed at the same time each day have lower levels of body fat, according to a study of more than 300 women from Brigham Young University in Utah. Chaotic sleep habits cause your internal clock to go haywire, which in turn causes your body to secrete fat-storing hormones like cortisol. The sweet spot? Try not to stray an hour from your usual sleep pattern, the study authors say. More than a 90-minute difference in sleep and wake times were linked to more body fat. (Tossing and turning? Check out these 100 tips to sleep better every night.)
Appetite-suppressant drugs and other diet pills:"Wonder" products that permanently reduce weight do not exist. Products that promise immediate or effortless weight loss will not work in the long run. Appetite suppressants, which often contain a stimulant like caffeine or hoodia, are associated with side effects including nausea, nasal dryness, anxiety, agitation, dizziness, insomnia and elevated blood pressure. Alli reduces fat absorption; following the package directions will reduce risk of side effects, which may include oily diarrhea and anal discharge. With any product, side effects may be worse if you exceed the recommended dosage.
Nuts are an excellent way to curb hunger between meals. They're high in protein, fiber, and heart-healthy fats. Studies suggest nuts can promote weight loss and improve cholesterol levels when eaten in moderation. They're also rich in calories, so limit your portions. If you have to get them out of their shell, you'll slow down and not eat as much.
I built this protocol for people who simply won’t take my advice to be patient and eat the Bulletproof Diet while using Bulletproof Intermittent Fasting. It uses biohacking techniques I pioneered on myself to reduce – but not eliminate – the risks of rapid fat loss. It prevents the metabolic harm and brain fog that come with very low-calorie diets (or multiple day fasts), and it does everything I can think of to maintain health in the face of additional toxins.  This is also not intended for people who are already fairly lean (10-14% body fat).  It is designed for obese and severely overweight people who want to lose fat as fast as possible.

Fleury, N., Geldenhuys, S., & Gorman, S. (2016, October 11). Sun exposure and its effects on human health: Mechanisms through which sun exposure could reduce the risk of developing obesity and cardiometabolic dysfunction. International Journal of Environmental Research and Public Health, 13(10), 999. Retrieved from https://www.mdpi.com/1660-4601/13/10/999/htm
It's the age-old question: How many sets do you need, and how much time should you spend in the gym each day? The answer varies from person to person, but when burning fat is the primary goal, a good rule of thumb is to train until you're pretty beat up, but not to the point at which you're flattened and thoroughly exhausted. That type of kamikaze training may satisfy your pysche, but it does a number on your anabolic hormones.
Sure, ketchup is tasty, but it’s also a serious saboteur when it comes your weight loss efforts. Ketchup is loaded with sugar — up to four grams per tablespoon — and bears little nutritional resemblance to the fruit from which it’s derived. Luckily, swapping out your ketchup for salsa can help you shave off that belly fat fast. Fresh tomatoes, like those used in salsa, are loaded with lycopene, which a study conducted at China Medical University in Taiwan links to reductions in both overall fat and waist circumference. If you like your salsa spicy, all the better; the capsaicin in hot peppers, like jalapeños and chipotles, can boost your metabolism, too.
Also, according to recent research, people who exercise in the morning are more successful at losing weight than those who worked out at night. In the study, researchers divided 48 women into two groups—one that did aerobic exercise in the morning for six weeks, and another who worked out in the evening—and asked them to record what they ate during the period. The results found that the early bird exercisers consumed less calories throughout the day and ultimately lost more weight than the night owls.
Creatine may be the most scientifically proven supplements on the market. It has been proven to lead to significant muscle growth over time. Although creatine doesn’t directly increase fat utilization within the body it will lead to a higher metabolism indirectly. Creatine intake boosts muscle growth and retention. That extra muscle tissue will, in turn, create a higher metabolic rate. This is why creatine supplementation is a good choice for any fat loss plan.

Belly fat is something that makes you look really bad and it is also very unhealthy. A sedentary lifestyle and wrong food choices are responsible for belly fat. However, not to worry, you can always do some core strengthening exercises to get the desired washboard abs. Here are some expert tips to show you the way to shed those extra pounds from your belly.
Cancer, a very common and sometimes fatal cause of unexplained (idiopathic) weight loss. About one-third of unintentional weight loss cases are secondary to malignancy. Cancers to suspect in patients with unexplained weight loss include gastrointestinal, prostate, hepatobiliary (hepatocellular carcinoma, pancreatic cancer), ovarian, hematologic or lung malignancies.
Usually work out for 30 minutes? Exercise for a third of that—but go hard! "An intense 10 minutes jump-starts your metabolic furnace and equals about 20 or 30 minutes at a moderate intensity," says Jordan Metzl, MD, author of Dr. Jordan Metzl’s Workout Prescription. If you can’t spare the full 10 minutes, you can sweat for even less time: According to a 2013 study from Colorado State University, exercising for just 2 ½ minutes at a high intensity (think running or biking sprints) can help you burn 200 more calories over the rest of the day.
No. That’s not what I’m saying. Cardio isn’t bad – quite the opposite. Everyone should do some form of cardio; swimming, walking, running, hiking, playing a sport – whatever. The point I’m trying to impress upon you is that most people resort to ‘cardio’ when trying to lose fat but it’s of the least importance when changing your body composition is the goal.
Unintentional weight loss can occur because of an inadequately nutritious diet relative to a person's energy needs (generally called malnutrition). Disease processes, changes in metabolism, hormonal changes, medications or other treatments, disease- or treatment-related dietary changes, or reduced appetite associated with a disease or treatment can also cause unintentional weight loss.[26][27][28][32][33][34] Poor nutrient utilization can lead to weight loss, and can be caused by fistulae in the gastrointestinal tract, diarrhea, drug-nutrient interaction, enzyme depletion and muscle atrophy.[28]
Unintentional weight loss may result from loss of body fats, loss of body fluids, muscle atrophy, or even a combination of these.[26][27] It is generally regarded as a medical problem when at least 10% of a person's body weight has been lost in six months[26][28] or 5% in the last month.[29] Another criterion used for assessing weight that is too low is the body mass index (BMI).[30] However, even lesser amounts of weight loss can be a cause for serious concern in a frail elderly person.[31]
Carbohydrates are almost as important as protein in the post workout shake. Carbs cause insulin release, and there is nothing better to lower cortisol levels that insulin. Insulin has an antagonist relationship with cortisol, meaning when insulin levels are high coritisol levels must be low. Also, since insulin is a storing hormone it will shuttle the amino acids from the whey protein directly into the muscle tissue.
Eat More Produce. Eating lots of low-calorie, high-volume fruits and vegetables crowds out other foods that are higher in fat and calories. Move the meat off the center of your plate and pile on the vegetables. Or try starting lunch or dinner with a vegetable salad or bowl of broth-based soup, suggests Barbara Rolls, PhD, author of The Volumetrics Eating Plan. The U.S. government's 2005 Dietary Guidelines suggest that adults get 7-13 cups of produce daily. Ward says that's not really so difficult: "Stock your kitchen with plenty of fruits and vegetables and at every meal and snack, include a few servings," she says. "Your diet will be enriched with vitamins, minerals, phytonutrients, fiber, and if you fill up on super-nutritious produce, you won't be reaching for the cookie jar."
Figuratively, this time: Stress is a diet saboteur and it adds belly fat. University of Florida Health researchers have discovered that chronic stress stimulates the production of a protein called betatrophin, which interferes in normal fat metabolism. Meditate, get a massage, take a vacation—just find a way to ditch the stress and those pounds will melt away like your troubles. Here are 37 ways to ease stress today.
"When going out for fast food, I used to get the large-size value meal. Now, I satisfy a craving by ordering just one item: a small order of fries or a six-piece box of chicken nuggets. So far, I've shaved off 16 pounds in seven weeks, and I'm on track to being thinner than my high school self for my 10-year reunion later this year." —Miranda Jarrell, Birmingham, AL
1. High Intensity Interval Training (HIIT): This type of exercise is your key to melting belly fat fast.  HIIT is highly effective for all over weight loss, particularly removing stubborn belly fat. If you are not eating right, you have reached menopause or you are not losing weight you should do these exercises. Don’t let the name scare you as it is you who determines the intensity.  It is your perceived exertion that counts.
When you eat carby, sugary foods and snacks, you end up with the all-too-familiar sugar spikes and energy crashes. That’s all due to insulin, which skyrockets when you eat carbs. Insulin also tells the body to store calories as fat — and most people trying to lose weight aren’t looking for extra padding in the belly or thighs. Since dietary fat has less impact on insulin levels than carbohydrates or even protein does, you don’t have to worry about sugar crashes, cravings or storing rolls of body fat.
Belly fat is, in fact, the colloquial term for abdominal fat. According to medical experts, belly fat can be potentially dangerous. Excess of it can lead to a number of health problems including heart diseases, high blood pressure, type 2 diabetes, a decrease in the level of HDL or good cholesterol, and can even lead to strokes or sleep apnea. You need to combat this problem before it gets too late.

• “Must Haves”: ‘Must haves’ are things that you absolutely must have in your diet or it’s a no-go. Now, don’t get me wrong, chances are that there will be some things you’ll have to remove if they’re going to impede your progress (like trigger foods); but generally, these will only amount to a small number of things, whereas the must haves will be the overarching things, like certain foods, macros, etc.


"The answer is: it depends on your metabolism," Dr. Arad told POPSUGAR. Your metabolism relates to how your body produces energy from fats, sugars, and proteins as well as how it stores energy. Your metabolic rate, the number of calories you burn in a unit of time, provides insight on whether you have a fast or slow metabolism and how much energy you burn. To determine your metabolic rate, you'll need to get a resting metabolic rate (RMR) test (typically $250, but rates will vary), which are currently offered at specialized clinics like Fitnescity.
Whey protein is best known for its ability to increase muscle growth and recovery which becomes vitally important on any fat loss plan. Many of the benefits of whey are due to its fast digestion rate and high concentration of the amino acid leucine. It is important to remember that anything that is used to build muscle will also maintain muscle while dieting.
Their happiness was all I needed to take the plunge and I dove in with a vengeance! When Amanda says if you follow the plan it works and honestly that is what you have to do. You have grace when you fall off the agenda, but it's easy to pick yourself right back up with the added encouragement of your group. The workouts are tough but doable and you can modify to meet your athletic needs.
I was four months postpartum with my fifth baby in seven years when my girlfriend, Katie, posted about this new program she was doing and how much she loves it. I had been stuck for weeks with no progress and was so tired of feeling so drained and uncomfortable in my own skin. I have gained {and lost} 70lbs with all five of my kids. Not from being lazy, or unhealthy, it’s just what my body does. But, five babies and losing weight looks a lot different. I was older, my body was tired, and I felt like I was never going to get this weight off. I tried the programs and foods I had tried in the past and instantly felt unmotivated and burnt out. I knew once I saw her results and talked about it with her I had to try. It was the best decision I could have made. Six weeks later I’m down 16 lbs, 11 inches, 2 pant sizes. Most importantly, I have the energy to keep up with my five young kids, teach my kindergarteners during the day, and finally feel comfortable in my own skin again. I’ve already gotten some of my girlfriends signed up for the next round, and I can’t wait to see where I am after another six weeks! This program changed my life when I truly felt like I wouldn’t ever get myself back. Thank you!
6 weeks ago we did our first juice cleanse and Lee was "embarrassed" to take his juice to a meeting, now he's actually talking to his guy friends and sharing what we aim for with nutrition and workouts, (this is more often at the pool or when we meet up for dinner) I'm so happy he is telling people and not writing it off as another one of my crazy ideas. He also gets excited that his clothes fit better and has repeatedly said how much he enjoys the "structure" of the circuits - something he didn't have before. I can attest to his better sleeping (asleep as I submit this), and if you don't tell, his bicep flexing he loves to do now (LOL). Overall he ended the first round down 9lbs and 5.5 inches collectively. Mindful eating when I'm not around and accountability on his part have been a huge win.

The Women's Health Diet isn't about eating less; it's about eating more—more nutrient-dense food, to crowd out the empty calories and keep you full all day. That's important, because restricting food will kill your metabolism. It sends a signal to your body that says, "I'm starving here!" And your body responds by slowing your metabolic rate to hold on to existing energy stores.
Our journey started years ago when life decided to throw us into emotional turmoil. As a couple, we desired and longed to have children. Our hopes were shattered when we found out the little girl that we had prayed for had a terminal disease that was not compatible with life. We lost our little girl on Thanksgiving Day. We both began to lose site of our physical health as we were in survival mode. Emotional eating took over. A couple of years after we lost our daughter, my father in law committed suicide which again sent our family into a spiral of unhealthy choices as we were trying to cope with tremendous loss. Our physical health was of no importance as we were trying to heal emotionally. We were consumed by many unhealthy habits that temporarily made us feel better. Fast forward a couple of more years, and I was diagnosed with an extremely rare tumor in my low back. After my first surgery, the tumor returned aggressively within 3 months and my treatment options were small. At this time we realized that our health is nothing to take for granted. We had 2 small children that needed healthy parents. After years of abusing our bodies with unhealthy foods and lack of exercise, we decided to get serious about our health. Shawn worked out and I struggled to find a program that would actually work. Shawn was not a "program" type of guy but I needed structure and something to follow. I had tried so many things and nothing seemed to work. I was struggling with chronic pain and I seemed to never be able to complete anything because my body wasn't allowing it. I found the FWTFL program on a blog and started researching. The premise made sense to me, but I still needed direction. Shawn bought the first round for my Mother's Day gift and I knew this was my last hope. I was amazed that within the first 3 weeks, the pain in my low back and hip was so much better. My body was allowing me to work hard and I was getting stronger. I think the progressive workouts combined with whole food nutrition was key. My body was responding well. I wanted to continue because I knew it would only get better! After the first 6 weeks, I was a changed person. Emotionally, I felt amazing....for the first time in years. I felt confident and I could see awesome physical changes. I signed up for the second round and this is where Shawn entered the picture. He was so impressed with the changes I saw in the first round that he wanted to give the Men's Group a shot. I think for us, we wanted the physical changes in our appearance but it became so much more. My body was actually healing from the chronic pain and THAT was the selling point for Shawn. Because I am still battling this tumor, I have MRI's every 4 months. My last scan showed that what I was feeling was real. I have been battling bursitis in both hips for years. My last scan show this was totally gone. That is a huge win. This program not only gives you results physically but it allows your body to be as healthy as it can possibly be! Shawn was impressed and decided it was time for him to take control of his health as well. Together, we endured the loss of our baby, the loss of a father and we have battled for my health. Together, we ate clean, never missed a workout and pushed each other to be the best, healthiest we could possibly be. Together, we will continue to make healthy choices and live a life that will push others to do the same. We are both thankful for the knowledge that Amanda shared with us. It has given us the ability to take control of our emotional and physical health. We are two grateful people that share a passion for life and we do not take our health or each other for granted! We appreciate this opportunity!
Break out the lemon wedges: Regular fish eaters tend to have lower levels of the hormone leptin — good because high levels of leptin have been linked to low metabolism and obesity, says Louis Aronne, M.D., an obesity specialist at the New York Presbyterian Weill Cornell Medical Center. Try to consume three to four servings of a fatty fish, such as salmon, tuna or mackerel, each week.
There’s one thing to like about visceral fat: It yields fairly easily to aerobic exercise. Vaporizing calories via running, biking, swimming—anything that gets your heart rate up—is an effective way to whittle your middle. In fact, one 2011 study from Duke University Medical Center, published in the American Journal of Physiology, found the sweet spot: Jogging the equivalent of 12 miles a week was even more effective in reducing visceral fat than resistance training three times per week. However, both types of exercise were beneficial when it came to belly fat, the researchers say. (Don’t have time to hit the gym? Try these fun at-home cardio workouts if you’re in a pinch.)

Stress may contribute to abdominal fat, according to several studies, including a recent one at the University of California, San Francisco. "When you're stressed, hormones like cortisol stimulate your appetite, slow your metabolism down and encourage fat storage inside your abdomen," explains Shawn Talbott, Ph.D., director of the Nutrition Clinic at the University of Utah. So what's a frazzled girl to do? "Find an activity that reduces stress for you, whether it's listening to soothing music or taking yoga, and do it daily," advises Talbott.
As said before, measuring your waist with the tape is the easiest way to check belly fat. Measure your torso at the level of your navel. As per the official guidelines, measure your abdomen from just above the hip bone or the iliac crest, just where it intersects the line dropping down from the middle of the right armpit. Breathe normally while taking the measurement, and don’t hold the measuring tape too tight against the skin. Those with a waist size more than 33 inches are at risk of developing chronic heart disease.

The study authors believe that sleep deprivation can cause your body to produce extra hunger hormones (like ghrelin) and fewer satiety hormones (like leptin). This means you’ll feel hungrier and have a harder time controlling your cravings once they hit. Most adults should aim for at least 7 to 9 hours of shuteye per night, per the National Sleep Foundation’s recommendations.
Tight deadlines, bills, your kids—whatever your source of stress, having too much of it may make it harder for you to drop unwanted pounds, especially from your middle. And it's not just because you tend to reach for high-fat, high-calorie fare when you're stressed, though that's part of it. It's also due to the stress hormone cortisol, which may increase the amount of fat your body clings to and enlarge your fat cells. Higher levels of cortisol have been linked to more visceral fat.
Men and women squirrel away fat differently, according to Harris-Pincus. On average, women have six to 11 percent more body fat than men. That extra fat typically gathers lower on the body (especially before they hit menopause) around the hips and thighs, creating a pear-shape. Men, on the other hand, tend to accumulate fat around the belly (hence, the beer gut).
But if you're trying to get ripped, you must minimize your consumption of fat. Protein, on the other hand, not only adds to your muscle—key in boosting the metabolism—but actually increases your metabolism more directly. The body burns more calories processing protein than it burns to process carbs or fat, known as the thermic effect of food. That's the main reason diets that include a lot of protein result in greater fat loss than low-protein diets, even when both diets contain the same amount of calories.
Don’t think going low-carb on the overfeed day is going to improve the results. It will make them worse. You do not need to avoid fat, but you do need to work on making sweet potatoes, yams, and white rice the bulk of your diet for this one day. You can drown your sweet potatoes in butter or not; it doesn’t matter as long as you eat the potatoes.  It’s important to choose glucose based carb sources like sweet potatoes and Taro over fruit. Fructose is 10-20% more lipogenic (fat forming) during overfeeding than glucose.
A different way of viewing weight loss identifies the problem as not one of consuming too many calories, but rather the way the body accumulates fat after consuming carbohydrates—in particular the role of the hormone insulin. When you eat a meal, carbohydrates from the food enter your bloodstream as glucose. In order to keep your blood sugar levels in check, your body always burns off this glucose before it burns off fat from a meal.
Intermittent fasting—limiting your eating hours to just eight, say between 10:30 and 6:30—has gained popularity as a way to shake up your metabolism, and it just might work. “There is a lot more research that needs to be done but it does seem to benefit some people, particularly men,” says Angel Planells, RD, a spokesperson for the Academy of Nutrition and Dietetics based in Seattle. Another approach is to fast—or eat next to no calories (500-600 calories total)—two non-consecutive days a week. (You can eat normally the other five days.) The tactic seems to increase fat burning. “When your body isn’t getting fuel, it will start burning fat,” Planells says. Read about this woman’s experience with intermittent fasting.

You must have noticed that some of your friends eat a lot of sugar-based foods, fried foods, or cold drinks. Yet, they manage to have a flat stomach, the reason being they have a very high metabolic rate. If your metabolism is not good, you may have a bloated stomach. Thyroid conditions, diabetes, and other medical conditions can be the reasons for slow metabolism.


The sad truth is that conventional ideas – eat less, run more – do not work long term. Counting calories, exercising for hours every day and trying to ignore your hunger? That’s needless suffering and it wastes your time and precious willpower. It’s weight loss for masochists. Eventually almost everyone gives up. That’s why we have an obesity epidemic. Fortunately there’s a better way.
We don’t always eat simply to satisfy hunger. All too often, we turn to food when we’re stressed or anxious, which can wreck any diet and pack on the pounds. Do you eat when you’re worried, bored, or lonely? Do you snack in front of the TV at the end of a stressful day? Recognizing your emotional eating triggers can make all the difference in your weight-loss efforts. If you eat when you’re:
Foods that are rich in water take up more room in your gut. This signals the body that you've had enough to eat and leaves less room for other foods. Many raw fruits and vegetables are full of water and nutrients and low in calories. Watermelon is a great example. It's a good source of the antioxidant lycopene and gives you some vitamin A and C, too.
Over the past five or six days of this protocol, you’ve been in deep ketosis and burning only fat, but you haven’t had to be particularly calorie restricted. In order to reset leptin levels and prevent a large drop in energy levels, you need to re-feed. Contrary to our normal recommendations, you need to pound down the carbs. When it comes to normalizing leptin levels, fat has no effect, while carbs are going to send them sky high.
However, due to the intense exercise, the total calorie consumption is higher. We burn more calories due to the hard muscle work – even AFTER the run. The body needs more energy for recovery, thereby burning even more calories. That’s how you benefit from post-workout fat burning and the afterburn effect (EPOC, excess post-exercise oxygen consumption).

Do more HIIT: High intensity interval training (HIIT) is as close to a magic pill as we have (except it involves a whole lot more work than just swallowing a capsule—sorry). Not only does it surge your body to max intensity during the workout, but because you’re working so hard, your body can’t deliver enough oxygen in the moment, explains personal trainer Jeremey DuVall. Your muscles accumulate a “debt” of oxygen that then has to be repaid post-workout. This throws your body into a phase of fat burning for hours after you’re done sweating, known as post-exercise oxygen consumption, or EPOC. Plus, super intense circuits like this activate muscle-building hormones like growth hormone and IGF-1, he adds.
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