Is fat actually healthy?

victoriaxoxo
I have recently gotten into a heated debate with my best friend about weight and its relationship to health and longevity. It all started with us discussing Lizzo (the very curvy American artist):
Is fat actually healthy?
Ok, so first of all, I LOVE Lizzo for the great artist she is, I listen to all of her songs. I do, however, have a problem with how she promotes her weight to be a good thing. Of course, not alllllll the time; sometimes it is just about body positivity and being ok with yourself. But some of her songs sound more like she actually thinks being THICC like her is good. For example:

In her videos she is often very skimpy with her clothing, and in a few of them she is portrayed either eating/drinking or cooking. Sometimes, it seems almost as if Lizzo it trying to capitalise on the commotion that she knows she will cause by promoting obesity.

So the debate was my friend disagreeing with my perception of Lizzo, primarily on the point that she is promoting obesity. My friend thinks that Lizzo is in fact promoting a healthy body image that has previously been distorted by celebrities and society into something unhealthy. When I brought up the fact that most medical research/info I found online actually states that excessive weight can lead to various health problems, my friend clapped back by saying that most of this research is outdated and wrong. She says that most medical practitioners would now agree that previous assumptions about extra fat being unhealthy were based on hate and stereotyping.

I am not a medical expert or anything. And I do know that fat is generally necessary so a woman’s body can function properly. But I always thought they meant fat in the range of 20-35%. Something like this being the median ‘optimal’ fat percentage:
Is fat actually healthy?
However, my friend told me that my beliefs are in fact out of date.

Am I actually confused?
Is fat actually healthy?
36 Opinion