As Max explained, fat loss progress is far more "linear" than weight loss progress, with a far more steady development as opposed to a constantly fluctuating one. Putting it into context, Max notes that "our body fat percentage or lean mass does not fluctuate in the instance where we drink a glass of water, or eat a big meal and then step on the scale — only our bodyweight does this."
Gastrointestinal disorders are another common cause of unexplained weight loss – in fact they are the most common non-cancerous cause of idiopathic weight loss. Possible gastrointestinal etiologies of unexplained weight loss include: celiac disease, peptic ulcer disease, inflammatory bowel disease (crohn's disease and ulcerative colitis), pancreatitis, gastritis, diarrhea and many other GI conditions.
Of course, not all carbohydrates are equal. In short, fast-digesting carbs tend to create a large insulin burst, leading to more potential fat gain. These carbs include white bread, most cold cereals, any sweets, rice cakes, white rice, and white potatoes. Conversely, slow-digesting carbs (found in whole-grain breads, oatmeal, sweet potatoes, and legumes) don't cause much of an insulin rise, so these should make up the vast majority of your carb consumption.
In our eat-and-run, massive-portion-sized culture, maintaining a healthy weight can be tough—and losing weight, even tougher. If you’ve tried and failed to lose weight before, you may believe that diets don’t work for you. You’re probably right: some diets don’t work at all and none of them work for everyone—our bodies often respond differently to different foods. But while there’s no easy fix to losing weight, there are plenty of steps you can take to develop a healthier relationship with food, curb emotional triggers to overeating, and achieve lasting weight-loss success.
Carbohydrates also regulate muscle cell volume. You will notice that when carb intake is low your muscles will appear flat and smaller, because cell volume is diminished when carbs are restricted. This is because carbs are stored in muscle tissue as glycogen. Every gram of glycogen is stored with 2.7 grams of water. This can drastically effect the size of muscle cells.
Build more muscle: Cardio gets all the glory for melting fat, but it’s actually far more important to focus on building muscle. It’s pretty simple: Lipolysis happens in the mitochondria of the muscles, so the more muscle you have, the more mitochondria, and the more potential to burn. Plus, the more muscle mass you carry, the more your BMR is burning calories at rest. Strength training is also one of the strongest ways to spark production of testosterone and growth hormone, which both help to break down fat, Seedman adds.