Keto is a diet where the majority of your calories come from fats and you restrict carbohydrates to a very low percentage. The idea is that your body enters a state of ketosis where it runs on fats rather than glucose. At the end of the day it's still calorie restriction because you eat fats but stay at a caloric deficit, and the "miraculous" thing for hams is that it's a diet where you don't really feel hunger much because the fat is very filling.  Hams love if because you can still eat cheese and bacon and greasy things and they don't feel they're "on a diet". Now, you can do this diet but it requires discipline. There is no cheating and no sugar because it kicks you out of ketosis for a couple of days. This individual having a slice of chocolate cake and Starbeetus is basically not doing keto right, but tee hee!