Could your body adjust if you separated your macros into meals? Like all carbs for breakfast, all fat for lunch and all protein for dinner? What would happen?

Most requirements your body needs are over days and weeks, so it would handle things nutritionally just fine.

As far as microbiome and bowel movements go? Most people need more dietary fiber than they’re getting already. As long as you keep that up so you’re regular and not gassy, you’d be fine.

After all, the human body is able to graze on roots and berries and eat a big fatty meaty meal once a week, or survive solely on meat and fat and water for 8 months of the year. Macronutrient division by meal is well within that spectrum.

[off topic?]

Since you mentioned fiber, I decided to give a plug for wheat germ.
- I'd recommend sweet peppers and dried fruit (i like apricots) as snacks for fiber. still tastes great, is healthy, and will help with 'regularity', if needed.
What's concern about gas? I was under the impression fiberous foods lended themselves to gas production?

I wonder what an all-fat lunch would even look like. Foie gras and fat bombs with chipotle mayo? Lol. I don't think it would be practical and at worst you'd have diarrhea every afternoon.

Glass of oil
i'd combine fat and protein into one and go to a brazillian steakhouse.
- Realistically, my meals are more like half a chicken for 1, big bowl of pasta with tomato sauce for another, and a big salad with too much caesar dressing for the third. I tell myself it's balanced but I figure those off days aren't great for me.
"Hey, what's for lunch?"

"A stick of butter."
Shot of olive oil?
According to the label on the bottle, 50 x 1,400 mg soft gels of Kirkland Signature Wild Alaskan Fish Oil will hit 100% of recommended daily fat in take based on a 2,000 calorie diet, though you might eventually overdose on vitamin A (as retinol).
- Nothing says "bon appétit" like 50 gel capsules of fish oil.

I don't know what would happen to your body, but i know these would be the worst meals you'll ever have

Carb meal and protein meal would likely be fine... but fat meal... 🤮
- Cheese chips and guacamole could be okay, but if you can’t have any protein or carbohydrates, that would be difficult.
- It would be loose, I wouldn't expect someone to eat a stick of butter even though that is norm in some extreme diets. I'm more thinking along the lines of sometimes you eat 2 slices of bacon, sometimes you eat the whole pack. And yes, sodium would be another issue.

flip protein and carbs and you'll likely be fine.

All carb breakfast would lead to a big energy crash for me around 6 hours after that bread-breakfast.

Breadfast
- There's fat in bread. An only-carbs meal is basically eating straight sugar (glucose).

That's kinda what it expects actually, because for the majority of human evolution we didn't have guaranteed meals at regular(ish) times like we do now and what we did have would vary wildly in nutritional value. there should be no issues except the... aftermath of certain meals.

Pain is just weakness leaving the body

Pretty sure the fat meal will just become diarrhea.

Wait... This isn't how youre supposed to eat?

I think people could really get into the "10 slices of fairy bread for breakfast, half a pound of cheese product dipped in mayo for lunch, unseasoned boiled chicken breasts for dinner" diet if they gave it a chance

Agreed that the all fat meal would not exit well. It also might overstimulate your gallbladder? I'm not sure.

Edit: and your pancreas would probably also be mad at you.

I don't have an answer for you, but I do want to say: great question.

Remember: most flour contains protein so no bread and enjoy your pure glucose for breakfast.

I highly recommend not eating your keyboard. The most commonly-used macros probably taste like finger cheese.

Does that fall under my fat heavy meal or my protein heavy meal?
- I think it's part of a, "stabilizer diet"