so im runing the newest atm8 1.0.22 and randomly ill lose all my hearts and i cant get any new ones either. the only way ive seen to fix it is by dying multiple times to reset just a lil annoying to go from 30 to 10 hearts randomly

That's very strange! It's probably some sort of incompatibility with another mod setting your max health to a specific value. You could verify this by running /foodlist size the next time your health gets reset to see if it's forgotten the foods—if it hasn't, it must be setting the health and getting overridden.

I also just had this issue, very strange. Don't know what it could be.

Edit: I think in my case it was a conflict with the Reckless Enchantment ("Your health is reduced by 60% but you gain the strength effect relative to the level of the enchantment.") from MC Dungeons Armors. Eating food while under the effect of Reckless made me lose 2 hearts at a time. Should note the Reckless does not visually remove your health until you take damage yourself.

It looked like this: Use Reckless armor, take fall damage, max health visually changes to 6 hearts, eat potato, max health is now 4 hearts.

Edit 2: The mod was actually Dungeons Gear, not Mc Dungeons Armors, since that's for Fabric.