me too, my grand parents told me not to swim after eating, but that's not true ! The fact is after you eat you feel your stomach a bit heavy, so they must think you will sink if you swim ^^
in fact you start your digestion something like 2H after you eat. So the doc says you'd better swim immediately after eating, because the risk is worth as the digestion as started !
but i think, you can swim whenever you want, you just have to take care a you and if you dont feel good, well dont swim ;)
By the way, i'd like to try Onsen, but my wife dont like Hot water, so we won't try onsen during our journey ! (
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