Dude. If you eat 3,000 cal/day YOU WILL GAIN WEIGHT.
Might have been more than that. The body builder protein shakes were 2,000 calories each, plus three meals a day. Gained 5 lbs in a couple of weeks and after another 6 weeks of not gaining any more, I said the heck with it. Just my metabolism. Been 5’-10” with a 29” waist for almost 40 years now.