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Anybody who cannot acknowledge the epidemic of obesity in our time is brain dead. The consequences of obesity are huge and understated: obese people actually have brains that are 10% smaller than weight appropriate individuals.

I don't remember how they determined the cutoffs with BMI, i.e. 25, 30, 35, 40. It probably has a U or J shaped mortality curve, i.e. very skinny and very fat have the highest mortality. Check this excerpt from Wikipedia on BMI

While the formula previously called the Quetelet Index for BMI dates to the 19th century, the new term "body mass index" for the ratio and its popularity date to a paper published in the July edition of 1972 in the Journal of Chronic Diseases by Ancel Keys, which found the BMI to be the best proxy for body fat percentage among ratios of weight and height;[3][4] the interest in measuring body fat being due to obesity becoming a discernible issue in prosperous Western societies. BMI was explicitly cited by Keys as being appropriate for population studies, and inappropriate for individual diagnosis. Nevertheless, due to its simplicity, it came to be widely used for individual diagnosis, despite its inappropriateness.

That said, if someone has high blood pressure or type 2 diabetes and they are overweight, avoiding stuffing your face and getting exercise could be very wise.

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