i'll go out on a limb and agree with you. it's not "obvious" that obesity is linked to cancer unless you view the world through hindsight-glasses. skinny athletic people get cancer too.

it wasn't even "obvious" for most of the 20th century cigarettes gave you cancer. people have short memories.

a contemporary example: is it "obvious" right now that sugar gives you cancer? because to a lot of people it is blindingly, astoundingly obvious, and to some that sounds like conspiracy theory nonsense.

i don't understand this aversion to doing "obvious" science -- we have to do science to make things obvious, not the other way around.

Google « obesity cancer », you’ll find many. It’s just that I thought it was common knowledge by now..

It doesn't directly lead to cancer, it increases, to some extent, the risk of some kinds of cancer, which can be influenced by life-style choices, to evolve. (The title says "linked" in the sense of being correlated.) That's pretty much common knowledge.

putting more unhealthy things into your mouth causes cancer, pretty obvious

Higher body mass means a larger amount of tissues which can develop cancer.

Because like smoking it’s obviously unnatural to eat like crap and sit on the computer/couch/car all day. If not obvious then not surprising. Obesity is the epitome and result ohf an unhealthy lifestyle of no exercise and eating junk food.