My girls (indoor only) eat wet food twice a day for a morning meal and then evening meal. I leave the food in their dishes and it doesn't (so far) have any ill effects on the cats. The only thing I change in the summer is I have a stainless steel bowl with a cooling gel in it and put their food in that to keep it cool. I do not keep my home very cold in the summer therefore I like to just add that cooling factor to the wet food. Both mine were shelter cats and from the beginning when people told me about their sensitive stomachs I alway felt the drank out of puddles, ate garbage, etc. and survived therefore I really never had an issue with leaving their canned food out all day for them.