When I put a potion doesn't matter which, in my inventory my hearts/food turn a bit purple, see the pictures. When I remove the potion from my inventory it is normal again. (I'm not sure but I think it happened after I drink a potion of swiftness extended 8 min one.)
Edit: my cursor also turns purple, and green on quarts blocks, pillars etc.
Just found out: When you hold a melon it will remove the bug.
Duplicate of MC-46404 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.