I think the issue is one of getting adequate nutrition
(vitamins/minerals/etc). People generally eat poorly so being "modestly
overweight" means you are likely getting more vitamins & minerals than
skinny people but the down side is you're getting more calories. At
some point the excess calories overcomes the better nutrition. This
same issue holds true for having a heart attack. Modestly overweight
people are more likely to survive a heart attack than skinny people.
However, eating well, like paleo, is going to prevent the heart attacks
in the first place and I "speculate" that it will increase longevity and
heart attack survivability.
>> Stay informed about: Excess Weight Ups Risk of Death, No Matter Where It Collects