Does it matter what you eat ?

Does it make a difference if you eat 1,500 calories at McDonalds or 1,500 calories of clean food when losing weight ? I know, clean food is better for your health, but I'm just asking in terms of losing weight, does it matter if I eat 1,500 calories of burgers or 1,500 calories of salad and apples everyday ?Cause someone actually lost 37 lbs eating only at McDonalds: http://sploid.gizmodo.com/man-loses-37-pounds-by-eating-exclusively-at-mcdonalds-1496972541

I agree with everyone else that purely for weight loss it does not matter. I will however add to this. If you ate 1500 calories of McDonalds I would say that you would probably have a high probability of eventually not sticking to your diet. 1500 calories of fast food is likely to be much less satiating then if you ate fruits, vegetables, lean meats, fiber, etc. While 1500 calories is 1500 calories, you need to think about the likelihood of adhering to your plan as well. If the amount of food you get is going to be insufficient for your appetite then your odds of eating more then 1500 calories increase.

A bunch of people will pick on you for using the word "clean." Some get very personally offended by that word and throw temper tantrums over it, lol.

I don't think I ever "pick on" anyone, let alone for using the term "clean" for food. However, although I didn't happen to even notice it this time until Kalikel commented, it's true that I think it's an unfortunate and quite silly word to use to describe food. Usually what people mean is "nutrient dense" food, but it gets confusing because some use it to mean food that is not whatever arbitrary thing they've decided people shouldn't eat, like anything containing grains or added sugar or even dairy or saturated fat or the like. It's confusing and relies on the premise that others are eating "unclean" foods, which sounds a bit Levitical for a discussion of nutrition.