Gabe Newell, the Valve founder often nicknamed Gaben, has not publicly documented a distinctive “Dota 2 diet style” that can be verified. The safest answer is that there is no reliable public record of him following a specific named diet, so any claims about it are mostly rumor or internet speculation.
What is known
What people usually mean by this question is one of two things: either a joke about Gaben’s appearance, or a search for some secret gaming or performance diet. There is no solid evidence of a special regimen tied to Dota 2, esports training, or a public health plan from him.
Rumors and mix-ups
A lot of online posts confuse different people or copy fitness content from unrelated figures. Some pages discuss strict athlete diets or very low-calorie plans, but those are about other people and do not support any claim about Gabe Newell.
The practical answer
If you are asking whether Gaben used a specific “Dota 2 diet” to stay sharp for gaming, the honest answer is no verified diet style is publicly known. If you are looking for a meme version of the question, that is mostly fan humor rather than fact.