Adipose tissue retains an epigenetic memory of obesity after weight loss

As someone who's struggled with weight loss, and have known others to struggle with it well, I think we colloquially called this "slow metabolism".

It always did feel like it was easier to gain weight than lose it, especially fat weight and not muscle weight for me.

I was recently sent a video about fat adaptation (basically teaching your body to be better at burning fat) by a very fit friend, but I wonder how much of that is bro science and how much of it is grounded in reality. Maybe worth looking into more deeply if it can counteract or balance out this.

Jason Fung is probably the world's leading research expert on obesity. If you want videos to watch on it, it starts and ends with this guy. He has done a ton of lectures and blogposts going back over a decade, and also has the stereotypical clickbaity YouTube videos.

https://www.youtube.com/watch?v=YpllomiDMX0

He has surely dedicated a significant portion of his life to his own pet theories on obesity, but to consider him a well-regarded expert is very misleading.

He has quite a few claims that are just...ridiculous, and his pop science books have some serious flaws (as reported by actual experts).

While I don't doubt you, it would be helpful if you cited these experts, so people can learn.