Eating fast food every day is obviously unhealthy, but he presented a fundamentally dishonest and inaccurate account of what it would do to you by failing to disclose his severe alcoholism.
Nobody that has done what he did since then has developed liver problems. He presented that as a major issue in the doc, while failing to admit that he had been binge drinking daily for three decades.
He also admitted to sexual misconduct during metoo, even admitting that he had been accused of sexual assault. It effectively ended his career.
He was not a good documentarian nor a good person.