Just had a Kerbal sink to the ocean floor at the start of a new career, and then discovered none of them could jump at all on Kerbin once I got the first one dry. No inventory to weigh them down, but then I looked a little lower. Um.. 200 snacks is a bit excessive, Jeb.
The rest of them are gluttons as well. Reinstalled Snacks 1.16.3 on KSP 1.7.2 and same result. Removed Snacks and was able to hop around like a little green bunny and float just fine.
Snacks.cfg file shows Snacks_EVA_Resource should be 1.0, but it seems to be pulling from the Snacks_Part_Resource instead, which is set to 200.