Eat few, in general. Don't force your body to store fat you won't need.

Even proteins, I just learned that unused proteins will be converted to fat.

Also, if you agree that gut microbiome is important, try to eat foods that will be benefitial to them, like https://en.wikipedia.org/wiki/Microbiota-accessible_carbohyd... (another thing I discovered recently).

Then there's fasting and autophagy but it's a bit harder (I'm just starting IF and it requires a bit of dedication tbh)