Coffee
Caffeine for alertness, antioxidants.
- Category
- Drinks
- Plate rating
- 78/100
- Glycemic index
- ≈0 (no carbs)
Medicine note: Caffeine and medicines
Some medicines make caffeine's effects stronger. Read more.
What coffee offers
- Caffeine for alertness
- Antioxidants
When to eat it
Morning.
Tip
For most healthy adults the FDA cites up to about 400 mg caffeine a day (roughly two to three 12-oz cups of coffee)
Blood sugar
Contains little or no carbohydrate, so it has almost no direct effect on blood sugar. GI values are approximate and vary with ripeness, variety and preparation. If you manage diabetes, ask your care team how this food fits your plan.
More drinks
Sources
- Nutrient data: USDA FoodData Central (search “Coffee”)
- FDA: Spilling the Beans — How Much Caffeine Is Too Much?
- MedlinePlus: Ciprofloxacin
Last reviewed October 2026. How we rate foods.
General information only, not medical advice. If you take medicine or manage a health condition, check with your doctor, pharmacist or a registered dietitian before changing your diet. Read our medical disclaimer.