Brain use 100–130 grams of glucose per day

Your brain doesn't have a specific daily sugar requirement, but it does require glucose (the form of sugar your body uses for energy).

How much glucose does the brain use?

A healthy adult brain uses approximately:100–130 grams of glucose per day

This equals about 400–520 calories, since each gram of carbohydrate provides 4 calories.

However, this does not mean you need to eat 100–130 grams of sugar.

Where does the glucose come from?

Your body gets glucose from:

🍚 Rice

🥔 Potatoes

🍞 Bread

🍎 Fruits

🫘 Beans

🥬 Vegetables

🥛 Milk

Even if you don't eat much carbohydrate, your liver can make glucose from protein and other compounds through a process called gluconeogenesis.

 During prolonged fasting or a ketogenic diet, the brain also uses ketones for much of its energy, reducing its glucose needs.

Do you need to eat sugar?

No. There is no minimum requirement for added sugar (table sugar, candy, soda, desserts). 

Health organizations recommend limiting added sugars:

Men: No more than 36 g (9 teaspoons) of added sugar per day.

Women: No more than 25 g (6 teaspoons) of added sugar per day.

If you're exercising or lifting weights

Since you've been interested in muscle health and nutrition, focus on complex carbohydrates rather than sugary foods. These provide a steady supply of glucose and include:

Potatoes

Sweet potatoes

Oats

Brown rice

Whole-grain bread

Fruits

These foods support both your brain and muscles without the rapid blood sugar spikes that come from large amounts of added sugar.