Someone who has gastric bypass surgery has to eat that way for the rest of their life because the size of their stomach has been reduced but they do not starve themselves. I have a friend who had lap band surgery and of course the amount of food she eats is drastically reduced. She has to make sure each and every calorie counts as healthy calories to get the nutrients her body needs. She drinks ensures or eats a small meal every two hours or so. The body is not technically in starvation mode because she is constantly giving it something even if it is a small portion.
Of course if you restrict calories long enough you will lose weight. Your body holds on to it for awhile but it cannot hold on to it forever. When you have such a limited amount coming in, it has to pull from somewhere. The thing is, it is usually not just pulling from just fat but your lean muscle as well. People think this weight loss is all fat but it's not and is not healthy. You are hindering your body's functions! Another thing about very restrictive diets is that most dieters don't eat that way forever so when they start eating again the body puts the weight back on and then some. You CAN lose weight by starving yourself obviously...look at anorexics, the thing is you have to keep starving yourself indefinately or you will gain. Most anorexics body's are in starvation mode which is why they are so fearful to eat. Eating one regular meal may cause their body to gain weight because it is trying to hold on for dear life! Starvation mode is real!
Starving yourself and fasting are two differnt things. Fasting (especially supervised) has been proven to have all sorts of medical benefits as well as removing toxins from your body. Fasting is not recommended for permanent weight loss though because of course, you will gain back what you lost when you start eating again.
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