As an overweight person, I don't think it's controversial. You'll also accrue personal and professional benefits from being a tall man and/or good-looking.
However, "fat people have no self-control" is still fatphobia and ignores the interplay of genetic, metabolic, physiological, cultural, socio-economic, and environmental factors that contribute to obesity. There are countless fat people who are incredibly smart and hard-working, and have exquisite discipline in most areas of their life.