Carbohydrates are converted into sugar when they enter your bloodstream. Since your body doesn’t usually need all the energy that the sugar produces, it converts most of the energy into fat. The plummet in blood sugar levels that always follows a spike causes you to feel hungry for more sugar. If this cycle is continually repeated, you won’t be able to lose weight fast; in fact, you might gain weight.
You probably feel this way because if you cut junk food out completely and suddenly, your body is shocked by the sudden change. Also, junk food has a lot of sugar, which can make you feel energetic, so when you cut junk food out right away your body isn't used to not getting the sugar you used to consume. My advice is to take baby steps. Cut out candy/ice cream, then chips, then soda. etc. until you are consuming less or none at all.
Try the paleo diet to help you avoid processed foods. Back when cavemen still ruled the earth, they didn't have time to bake cupcakes or fry potato chips. The paleo diet (short for paleolithic) seeks to recreate the same diet that our early ancestors ate, claiming that our systems are not built for modern ingredients and cooking styles. You eat meat, vegetables, fruit, and other foods that would have been available back then, and avoid anything paleo people wouldn't have had.[12]
Since starting this diet on Monday I am down 10 lbs but I workout 2x a day. An 1hr in the morning using the elliptical and 30 min after work. The 1st day 4 lbs down then 2 each day after. I am on day 5. This diet is very hard but is paying off. I plan to do it again in about 2 weeks but incorporating fish and eggs because I also lift weights and need more protein. So this week I have not lifted as much because it does lack in that unless you can eat thing like beans for it. I gotta admit I got really sick of eating fruit all day because it taste way to sweet for me and felt like I had a sugar rush from eating candy even though it was fruit. I got sick of certain smells too but I pushed through and it’s going pretty well. Good luck to anyone else who tried is.
All meals are important, but breakfast is what helps you start your day on the right track. The best, heartiest breakfasts are ones that will fill you up, keep you satisfied, and stave off cravings later in the day. Aim to eat anywhere between 400 and 500 calories for your morning meal, and make sure you're including a source of lean protein plus filling fat (e.g., eggs, unsweetened Greek yogurt, nuts, or nut butters) and fiber (veggies, fruit, or 100% whole grains). Starting your day with a blood sugar-stabilizing blend of nutrients will help you slim down without sacrifice.
Going long periods of time without food does double-duty harm on our healthy eating efforts by both slowing down your metabolism, and priming you for another binge later in the day. (Think: You've skipped breakfast and lunch, so you're ready to takedown a whole turkey by dinner!) Make it your mission to eat three meals and two snacks every day, and don't wait longer than three to four hours without eating. Set a "snack alarm" on your phone if needed.
Instead of satisfying your sweet tooth with some refined sugar, turn to berries and enjoy a slimmer waistline in no time without exercise. Berries are loaded with antioxidants, which can help reduce inflammation throughout the body, and research from the University of Michigan reveals that rats given a cherry-rich diet shaved off a significant proportion of their belly fat when compared to a control group. Berries like strawberries, raspberries, blueberries, and blackberries are also loaded with resveratrol, an antioxidant pigment that has been linked to reductions in belly fat and a reduced risk of dementia, to boot.
If you've got weight to lose and you want it gone fast, try swapping out your usual proteins in favor of fish. Not only is fish lower in calories than an equivalent amount of beef or chicken, a study published in Obesity reveals study subjects who added omega-3 fatty acids, like those found in fish, to their diets shed more weight and had an easier time keeping it off than those who skipped them.
Use the meal as a reward for a week’s worth of hard work, or the completion of a project you’ve been dreading. “It’s OK for people to blow one meal a week without feeling guilty,” says James W. Anderson, M.D., director of the Metabolic Research Group at the University of Kentucky in Lexington. “If you follow a healthy diet 95% of the time, you can relax and enjoy yourself the other 5% of the time without gaining weight.”

Have a small, protein-heavy breakfast. Kickstart your day with a protein filled breakfast that will give you energy (and keep your blood sugar up) for the rest of the day. Aim for a breakfast that is 400 calories and eat it every morning at around the same time. Go for variety and rotate two to three options. Pair your breakfast with unsweetened tea or a glass of water with lemon.[6] 
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