What will happen if i don't eat complex carbohydrates?

Left to my own choice i would love to live off fruit, vegitables, nuts, dairy and the occasioal bit of tuna.

This seems to give me all the vitamins i need and sufficent protein, and fruit and veges are full of fibre. The disacharides in milk and fruit (fructose, sucrose and lactose) can give me quick energy, and the fat and protein in milk and nuts can give me slow burn energy (as could the slower to digest disachrides?).

But for some reason the "bottom of the food pyramid" is all starchy. What do i need complex carbohydrates for? They seem like just "empty energy".

(I'm not trying to loose weight, i just find the "bottom of the pyramid" foods a bit dull.)

p.s. brain needs glucose, which can be made from fat and protein by a long anabolic then catabolic prosess... or can be found in most disacharides by a relatively short anabolic process.

Carbs break down into sucrose. Your brain drinks sucrose 24/7, it's what the grey matter lives on. Studies have shown protein dieters are not only meaty smelling but a little mentally dull. So, bluntly put, you need carbs for your brain.

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