>Objectively measured physical activity may not be the key determinant of unhealthy weight gain in children.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3044163/

>Prospective studies, however, find little evidence of the more physically active members of a population gaining less excess weight than those who are the least physically active.

https://www.ncbi.nlm.nih.gov/pubmed/21832897?dopt=Abstract

>TEE adjusted for weight and age or PAL did not differ significantly between developing and industrialized countries, which calls into question the role of energy expenditure in the cause of obesity at the population level.

https://academic.oup.com/ajcn/article/93/2/427/4597724

> However, exercise is the largest driving factor in health _not_ weight

Citing a bunch of studies about obesity changes nothing about the fact that _exercise_ is more important to health outcomes than _weight_.

Another source for you: https://care.diabetesjournals.org/content/27/1/83

> There was no significant trend across BMI categories for mortality after adjustment for fitness.

Being skinny isn't being healthy, being _fit_ is being healthy.

>Citing a bunch of studies about obesity changes nothing about the fact that _exercise_ is more important to health outcomes than _weight_.

This is pretty funny. They directly address and contradict the point your trying to make. Even the source you posted contradicts what you are trying to argue. Nice try though