I am glad to find this thread and ones like it. I felt like i was going crazy. I had my first vaccine shot in March 2021 and my second in April 2021. I did get Covid in between shots and in the fall or 2021 I starting gaining weight rapidly. I am a 45 year old active female that works out about 4-6 times a week. I walk 3-4 miles at least 2-3 times a week and do a semi personal training HIIT class 1-2 times a week. I get my lunches prepped by a meal prep company (and put this on hold for a few months to see if this was part of the problem) where the macros are listed on the meals and I had been getting this meals for at least a year before getting Covid. I was 119 when I got the vaccine/Covid and now I am about 137. I have tried intermittent fasting, counting calories, different workouts- running, lifting weight etc. This weight all came on in a matter of 2-3 months when I was being active. I have tried everything to keep it off- short of eating lettuce for 3 meals a day, and nothing is budging. I have been to my primary doctor, gynecologist, health coach and endocrinologist. As others mentioned, most of the weight is in my abdomen, and it is also harder to the touch. It is so frustrating!!!!