But since I started eating healthier, I dunno. I just don't crave it as much.
This comment piqued my interest again in something I was studying a couple months ago: gut microbiology. As I'm sure you know there's a rich microbiome existing your intestines that acts as a secondary organ, both auxiliary to the digestive system and independent with it's own various, much still unknown, functions.
What is very interesting is that the various microbes, being their own living things that have a vested interested in their own survival, will interact with their host (you) to try to better their own chances. This can be as subtle as discretely giving hormonal signals to store away more fat, or even more arguably insidious behaviors like sending chemical signals to your brain to influence how hungry you are and even specifically what to crave after. Now, what's additionally interesting is that your own body is co-evolved to be wary of this behavior of it's denizens, and your own body depending on the circumstances, such as being excessively stressed, will go out of it's way to curb or support these microbes, reining in some and even go as far as feeding your own body fat to keep others alive, hand-sculpting your microbiome for your own benefit.
Now, what had piqued my interest was whether or not exercise has a strong influence on the contents of your gut microbiome. I just did a google search, but I found this interesting article:
https://www.hindawi.com/journals/omcl/2017/3831972/To summarize the article, yes it does! Though like seemingly every ecosystem in nature, it's participants are strongly interdependent on eachother. If one's diet is poor, your gut microbiome cannot change no matter what; and that means that the existing microbes that are adapted to a fat and unhealthy environment are strongly incentivized to keep you fat and unhealthy. If one's diet improves, that can set the stage for a more diverse and healthier microbiome, but it would seem that the body also uses exercise as its own trigger to begin sculpting the microbiome towards a biome that rewards and additionally powers a more fit and active lifestyle. That's what I'm gathering from the article, as it's not totally conclusive and admits that more research is required.
It's just cool as hell, there's not really any action plan you could draw from this info other than "Yep, diet and exercise is good alright" so even with all that said, it's kind of a flaccid contribution to the thread. Though, I do think that the body's various hormonal systems play perhaps the most important role to weight loss and gain, to the point that it needs to be considered in full for any dietary plan to be effective, and that includes the gut microbiome.