Not long ago I had the pleasure(?) of overhearing a conversation about digestion over a meal. One woman was explaining why she wasn’t having carbs at her her meal (this despite the fact that the hummus she ate certainly contain carbohydrate, as did some of the vegetables with her meal). Her logic was that to aid digestion it’s better to consume food groups separately. Hence, she was just eating vegetables and meat. Someone else piped in that this made sense and added that eating foods in a specific order must also be beneficial. I did my best not to bite off my tongue and eat it along with my vegetables, meat, and (gasp!) rice.
Not everyone knows about how digestion works and I can see how these myths perpetuate. But please give your body some credit; it can handle more than one macronutrient at a time.
I’ve addressed the issues of food “layering” and combining before. Just a quick reminder: digestion starts in the mouth with amylase breaking down starches. Your stomach does an excellent job of churning all of the food you eat, breaking it down, and making it into an acidic stew. Believe me, nothing is sitting in there on top of everything fermenting. Most of nutrient absorption occurs in the intestine. Consuming more than one food at a time may actually aid in nutrient absorption as some nutrients, such as the fat soluble vitamins ADEK, need other nutrients to be absorbed (in this case fat).
This doesn’t even address the fact that many foods taste better together. Think: chocolate and peanut butter, apples and cheese, bread and butter. There’s no need to deny yourself the pleasure of these foods. Variety is the spice of life and choosing healthy foods is complicated enough without adding the element of what to eat with (or without) something else.