He said that diet is vastly more important to weight loss than exercise (it is), and your counter argument is that fat people are better protected from stabbings?
Good job trying to misconstrue my statement.
What I said is that diet isn't more important for weight loss than exercise. If you're looking at the most extreme cases where people are stuffing themselves full of the worst food they can find, yeah, okay, then diet is more important. But for everyone else exercise is more important. When you exercise, you're building muscles in your body, in your heart, you're quickening your metabolism and putting your body into action. Do you really think Jenny Craig is going to be better for you than exercise?
Even if you lose more weight through dieting than exercise, dropping a ton of weight too quickly and vastly changing your normal diet will shock your body and stress it for weeks until it can adapt. Not to mention all of the risks of complications, like liver damage.
Two of the primary functions of adipose tissue are to 1) pad and protect the internal organs and 2) store fat. Extra padding keeps your organs safe, and having large fat reserves is going to keep you alive longer when you're sick from chemotherapy or illness and can't eat. A skinny person in that case is going to die before a fatty.
What about when that fat person who gets stabbed has a blood sugar in the 400s, develops a really bad infection, becomes septic, and dies?
If you're a fat person getting stabbed, your attacker is going to have to stab a lot deeper or use a much longer knife to get into your internal organs. A skinny person can have their internal organs punctured with a much smaller blade so in that case the skinny person would be more likely get sepsis. Yeah, that fat person's blood pressure and blood sugar are out of control, but they're not dead.