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Both fats and sugars are helpful too, if you don't abuse them (probably the same for coffee).

(Certain) fats yes.. but sugar? I can't imagine that it's helpful in any way.

Quick energy is one use of sugars.

well you get suger in bread, fruits etc. You don't have to eat sweets to get daily intake of sugar(For example brain needs sugar for it to work).

Brown sugar is definitely better as a sweetener compare to the white refined sugar as all the healthy parts are stripped.

The brain needs glucose to function not sugar, which is one glucose and one fructose.

Brain cells can use ketones instead of glucose. That's what happens on a diet that severely restricts carbohydrates.

In everyday English, when someone mentions sugar, they are probably talking about sucrose aka 'table sugar'. And you are correct that sucrose consists of a glucose and fructose molecule bonded together.

In a more...official or scientific context, "Sugar is the generalized name for sweet, short-chain, soluble carbohydrates, many of which are used in food." as Wikipedia puts it. That means that sucrose, glucose and fructose (and many others) are all considered to be sugar.

Maybe I missed the point, but you seem to be implying that you need to eat things with sugar mentioned on the label on a regular basis to keep your brain functioning normally.

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