@trendo, I have a very very similar experience with this energy drain after eating carbs. If I eat a carb-loaded lunch I always feel tired in the afternoon and I dread the work day and the meetings that I have to go through. In those scenarios, I love to supplement with countless coffees, espressos and teas. BUT, while I'm on the keto diet, I can eat a large lunch that's filled with healthy fats like avocado, nuts, beef, etc. and I can get right back into the workday and actually feel even more energized. It's a truly amazing feeling, I highly recommend experiencing it for yourself!