Indeed. Around the time that Supersize Me came out I was looking to lose some weight. To prove a point to my friends I did this by going on a fast food diet. Unlike Spurlock, I actually tracked my calorie intake and this affected what I ordered. However, every meal came from one of McDs, BK, or Wendy's as there was one of each in my neighborhood.
I did indeed lose the belly fat I wanted to shed.
I'm sure it wasn't the healthiest thing I ever did, but from the perspective of fat loss it worked AOK
> t’s my biology. Other people have different biologies that will save calories irrespective of the source and use
There is zero scientific evidence about this.
This is modern voodoo.
I’ve eaten terrifically and exercised regularly. I’ve also been a slob and ordered Uber Eats from bed for a week. I don’t gain much weight either way. When I have, I can lose it within a week. (My figure changes. But not enough that clothes don’t fit.)
This isn’t because I follow some magic (ex post facto obvious in some way) diet. It’s my biology. Other people have different biologies that will save calories irrespective of the source and use; their basal metabolism adjusts to ensure they’re burning less than they eat, all the way to starvation.
In a calorie-deficit environment, or one stricken by plague that disease out digestion while the immune system goes full blast, I die first. In a calorie-rich and vaccinated world, they do. (Even then, mortality is higher amid low BMIs than moderate ones, largely due to disease outcomes.)