I don't believe in cheat days because I eat what I want, when I want, caveat, WITHIN MODERATION. Drink enough water, wash your face, brush your teeth, don't get too drunk and you shouldn't feel like shit. Bags usually means dehydrated or an allergy.  Meaning, I go out to dinner and have foisgras, escargo, veal and a salad with bacon on it. But I didn't go hog wild and I had a very light breakfast and no lunch. And I took a bunch home for leftovers. Slept like a baby.  Sometimes I don't each much at all, and sometimes I will grab a burger. Sometimes I eat "clean food", and sometimes I eat a gogo taquito from 7-11 because I have been working for 14 hours and need calories. We are primate garbage machines. Any calories are 'good' calories as they all go to powering our body and brain, we are actually BUILT to crave and process dense fats, yup fats. As long as you get the minimum amount of vitamins and minerals (literally you can get this from grog - rum and citrus and a hearty pirate ration) you will be fine. I love how people try to rationalize their diet by 'good' and bad foods, good and bad calories, good this, bad that. Dude, it is fuel, as long as you don't barf, or get the shits, or can't shit, you are healthier than 99.9% of fats.  If you would like to have me source shit I can probably pull out a ton of school books from primatology. The evolution of being able to process alcohol is pretty neat.