Because appetite is regulated by hormones. I happen to have personal experience with both sides of this. I’m 51 years old and I’ve weighed ~160lbs pretty much since I was 16 no matter what or how much I ate. Then about a year ago I found out I have adrenal and thyroid deficiency and started taking hydrocortisone and levothyroxine to replace the hormones my body doesn’t produce enough of and my weight started fluctuating for the first time in 35 years; I lost 10lbs at first, then gained 30lbs in 3 months, I’m hungry more often and have the urge to snack all the time, etc. I’ve had to start watching what and how much I eat and exercising for the first time in my life, all because of some hormone changes.
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