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true. calories in vs. calories out will get the weight off, for a while. it definately works (subway diet or taco bell diet anyone?), but there are more efficient and healthier ways to tweak the principle. depending on your goals though you can gain alot of benefits by manupulating protein / carb / fat proportions and incorporating strength training while on a caloric deficite. if you want to specifically target fat loss, rather than weight loss, for example you'll want higher protein and fat with less carbs and a good amount of heavier weight training. if you don't want your matabolism to crash, which will almost certainly lead to weight gain after the "diet" is over, you won't want to go too low on the calories or lose too much muscle mass while dieting. most people assume that when they're losing weight that it means they're losing only fat. its simply not true. a good portion of the weight lost on traditional american diets (cut calories and increase cardiovascular excercise with the goal of creating a 1000 kcal per day deficite and lose 2 lbs per week) comes from loss of muscle mass. this slows metabolism and is a significant factor in all of the yoyo dieting people do (along with low will power and the idea that once your "done" with the diet that you go back to eating how you used to).
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