I don't exactly know which recipes are affected by this but I do know it's been happening for a while now. Even when the pop up says it's Lactose free the Sim doesn't think so because they get affected by it. Even making something using Lactose free ingredients still somehow produces something that Sims get sick from as if it still has Lactose.
I'm not sure if vegetarian recipes are affected because I've only seen it happen with Lactose Free recipes.
It also seems to affect when they can get leftovers from the fridge even if the leftovers in the fridge don't affect their dietary preferences.
Edit: So I spent the good part of this evening just having my Sim cook lactose free meals and out of all of the recipes that I cooked and I cooked pretty much all of them and had my Sim eat most of them the only one that came up with the "wonder if it's worth it" interaction was the French Toast. Interestingly enough when I cooked it with using the Simply Living Lot Challenge that's when it came up but when I turned off the lot challenge the meal was lactose free. So now I'm wondering if it has something to do with the Simply Living Lot Challenge maybe it uses the lactose ingredients for the recipe even though I always make sure to uncheck use fresh ingredients.
If I find myself more time I'll try to use the different types of meals (instant/microwave/baking/grilling) and test those recipes as well.
Edit By crinrict: Added Tag to Title, Adjusted Title
