[Harmless Teddy Bear]

As a cook I can tell you that fruits and vegetables are mixed all the time.

Everything breaks down at different rates in your system. Even the same base food will break down at a different rate depending on how it is processed

You think you should only eat a single food at a time?

I have to admit that is one of the odder diets I have ever heard of but you do you I suppose.

[Jonty30]

I’m well aware of what people do, but the advice is simply that mixing them is not the optimal diet. There is a difference between optimal and allowable. I suppose it also comes down to the strength of your digestive system as well. If you are a bit more fragile in this area, it’s probably better advised to not mix the two.