Hello. Is it true that as long as you stay under a certain amount of calories a day but eat junk food you can still loose weight? For an example, say I need 2000 calories a day to maintain my weight. Every other day I'll go to mc donalds and get junk food but I'll make sure I stay under 2000 calories everyday. Will that still result in weight loss? Would I loose any more quick if I just eat healthy food instead of mixing it up with junk food? Does it honestly matter what you eat as long as you stay under 2000 calories?

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2000 calories at McDonalds, would that be 1/2 of a Big Mac and 10 fries?

yes calorically you are correct. But you did not take into account fat content. So you are wrong. Low fat and 2000 calories= weight loss