He glosses over amphetamines. They are highly effective at weight loss. So much so that ADHD patients have the stereotypical "Adderall skinniness" after 1-2 years of use. Addiction is a problem with stimulants, but psychiatrist routinely assess for addiction in the ADHD population. Why not prescribe Adderall for weight loss and similarly monitor those patients?
Which is better? A BMI of 40+ or a BMI of 25 and taking a daily stimulant?
The FDA agrees with the latter in at least one case. In 2015, the FDA approved the amphetamine lisdexamfetamine (brand name Vyvanse) for the treatment of binge-eating disorder.