Understanding Glycemic Index

The Glycemic Index (GI) is a number that shows how quickly a carbohydrate-containing food raises your blood sugar. It helps you understand which foods give you quick energy and which give you steady, longer-lasting fuel.

Colorful infographic displaying foods categorized by glycemic index: low index includes fruits and vegetables, medium index includes bananas and papaya, high index includes cake, watermelon, a donut, and beer.

Foods with a low GI are better for long-lasting energy and avoiding crashes. High GI foods can cause a quick energy boost followed by a crash, and over time, may lead to health problems like insulin resistance or type 2 diabetes.

How the GI Scale Works

The GI scale goes from 0 to 100, based on how fast a food increases blood sugar

Why GI Matters

  • Help you stay full longer, keep energy steady, and avoid blood sugar crashes.

  • High GI foods:
    Can give quick energy, but may cause hunger, fatigue, or sugar cravings shortly after.

    Even though some foods don’t taste sweet (like white bread or potatoes), they can still have a high GI. On the other hand, fruits like apples and oranges have natural sugar but a low GI — because of the fiber and nutrients that slow digestion.

  • The Glycemic Index helps you make smarter choices about which carbs give lasting energy and which might lead to sugar spikes.

    Choosing more low-GI foods (like fruits, veggies, whole grains, and legumes) can help improve energy, focus, and long-term health.

  • When you read a nutrition label, you’ll often see sections like:

    • Total Carbohydrates

    • Dietary Fiber

    • Total Sugars

    • Added Sugars

  • Carbohydrates are your body’s main source of energy. On a label, “Total Carbohydrates” includes:

    • Sugars (natural and added)

    • Starches (like in bread, rice, or pasta)

    • Fiber (which helps digestion and keeps you full)

    So when you see Total Carbohydrates, it’s the sum of everything in the carb family — not just sugar.

  • Under “Total Carbohydrates,” you’ll see “Total Sugars”, which tells you how much sugar is in the food.

    • Natural sugars come from ingredients like fruit or milk.

    • Added sugars are sugars manufacturers put in during processing (like in candy, soda, or flavored yogurt).

    If a label says:

    • Total Carbohydrates: 30g
        - Dietary Fiber: 5g
        - Total Sugars: 10g
          - Includes Added Sugars: 6g

    That means:

    • There are 30 grams of carbs total.

    • 10g of those are sugars (including 6g that were added).

    • The remaining carbs come from fiber and starches.

    • Carbs give you energy.

    • Fiber helps with digestion and blood sugar control.

    • Natural sugars (like in fruit) come with nutrients and fiber.

    • Added sugars don’t — they can lead to energy crashes and health problems if you eat too much.