Mine hovered around 170-175 pounds for 30 years and suddenly dropped to 155. That's not an alarming weight for a guy who's just a tad over 6ft tall, but it was sudden and very noticeable, and it was because I'd totally lost my appetite.
I was one who ate for the love of good food. I liked to cook it and I loved to eat it, but not since last April, when I got my 2nd vaccination. I hover between a little over 160 and as "much" as 168 now. I usually eat one pretty good sized meal a day, when my wife eats with me, but not every day. I don't feel hunger and food has lost its appeal. That isn't normal for me. Could be my age, idk, but it started a week or 2 after I was fully vaccinated. Maybe that isn't a coincidence.