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Nutrition labels and glycaemic index: Becoming fluent in the language of food.

29 June 2025

Do you ever find yourself puzzled by the information on nutrition labels? The numbers and ingredients can be confusing, but they hold the key to making smart choices about what you eat. Let’s explore how to read these labels and understand the Glycaemic Index (GI) so you can make decisions that support your health and well-being.

Nutrition Labels: A Guide to What’s in Your Food

Think of a nutrition label as a detailed guide to what you’re about to eat. It provides important information about serving sizes, calories, fats, and more. Let’s break it down:

1. Serving Size: The Starting Point

The serving size is what you should always start with. All the nutritional information on the label is based on this amount. If the serving size seems small but you typically eat more, remember that the values for calories, fat, and other nutrients will increase accordingly. For example, if you require two servings, the other values must be doubled. If you consume half the recommended serving, then you must halve the other numbers.

2. Calories: Your Energy Source

Calories measure how much energy you’ll get from one serving. Our bodies need energy (measured in calories) to function, for basic activities like breathing and digesting food as well as physical activities. If you eat more calories than your body needs, the excess calories are stored as fat, leading to weight gain. Therefore, if you’re watching your weight, keeping an eye on this number is essential. If you are living with diabetes, you will want to watch this number, as excess weight gain can worsen your diabetes.

3. Total Fat: The Full Picture

Total fat includes both good fats (unsaturated) and bad fats (saturated and trans fats). Unsaturated fats help lower bad cholesterol (bad fat) and clear it from staying in your blood vessels. This helps to prevent heart attacks and strokes. On the other hand, saturated and trans fats increase bad cholesterol, clogging your arteries and increasing your risk of heart disease.

Choosing foods high in unsaturated fats (like margarine instead of butter) helps improve heart health. This is especially important for people with high cholesterol, as they already have more bad fats in their bodies. Reducing bad fats and eating more healthy fats is important in protecting your heart and brain.

4. Cholesterol and Sodium:  Always Important to Consider

As mentioned earlier, high levels of cholesterol can be harmful to your health. Choosing foods low in cholesterol is better for your body in the long run. Sodium, found in salt, can also cause health issues, particularly by raising blood pressure. People with high blood pressure should limit how much sodium-rich (salty) food they eat. It's a good idea for everyone to keep an eye on these nutrients, especially if you eat them often.

5. Total Carbohydrates: More Than Just Energy

Carbohydrates are your body’s main source of energy, it is what gives you energy for a long day ahead. They include both dietary fibre and sugars. Fibre is great for digestion—think of it as a cleaner for your intestines. However, too much added sugar can be unhealthy, especially for people with diabetes who already have high blood sugar levels. It’s a good idea for everyone to choose foods high in fibre and low in added sugars.

6. Protein: Essential for Your Muscles

Protein is essential for the growth and repair of many parts of your body, including muscles, skin, hair, and nails. It also helps keep you feeling full longer, which can make it easier to manage hunger and avoid unhealthy snacking—a benefit for those looking to lose weight. Additionally, protein slows down the digestion of food, which helps keep blood sugar levels normal by preventing sudden spikes. This is especially important for people managing diabetes. High-protein foods are particularly beneficial for older adults who may need extra protein to keep their muscles strong, and for vegetarians, who may need to focus on getting enough protein in a plant-based diet.

7. Vitamins and Minerals: Key Nutrients

While they might not always get the spotlight, vitamins and minerals are very important for keeping your body functioning well. Foods rich in these nutrients are always an excellent choice. Look out for food options high in these, they tend to be fruit, vegetables, whole grains, nuts and seeds. Try and get a variety of vitamins and minerals, by eating a mix of different items

8. Ingredients List: What’s Inside

The ingredients list tells you exactly what’s in your food. The first few ingredients are normally the bulk of the food. So, if you see sugars or unhealthy fats at the top, you may want to reconsider!

Lastly, you might have seen The Glycaemic Index being mentioned around in recipes, food blogs, healthy eating articles, and so on, but what does it mean? It is actually a simple concept, let’s break it down.

The Glycaemic Index: Managing Your Energy Levels

The Glycaemic Index (GI) ranks foods by how fast they raise your blood sugar levels. Foods that cause quick spikes in blood sugar should be avoided, as it's healthier for your body to have slow and steady sugar level changes. Rapid spikes and drops can lead to bursts of energy followed by tiredness. Understanding the GI helps you choose foods that provide consistent energy, reducing the risk of fatigue and cravings throughout the day.

- Low GI (55 or less): Slow and Steady 

Foods like lentils, legumes, and whole grains release sugar slowly, providing lasting energy and helping to maintain stable blood sugar levels. These will give you a g[NN6] ood energy supply for the day ahead.

- Medium GI (56-69): Moderate Energy

Foods like brown rice and sweet potatoes offer a moderate pace of energy release, making them a good middle ground.

- High GI (70 or above): Quick but Short-Lived

High GI foods, like white bread and sugary cereals, cause a rapid spike in blood sugar followed by a quick drop, often leaving you feeling hungry again. People with diabetes need to be especially cautious with high GI foods, as they can quickly raise blood sugar and then cause it to come crashing back down. Since diabetics are less able to normalise their sugar levels, this can lead to feelings of unwellness and make blood sugar management more difficult.

Putting It All Together: Empowering Your Health Choices

By understanding both nutrition labels and the Glycaemic Index, you can make smart choices that support your health goals. Here’s how to use this knowledge:

  •  Pay attention to serving sizes to accurately measure how much you are eating compared to the recommended amount.
  •  Monitor how many calories you eat if you’re weight watching and conscious of your energy levels.
  • Opt for foods with healthy fats and less of the unhealthy ones.
  • Choose high-fibre carbs and limit added sugars.
  • Include lots of protein in your diet to stay full and strong.
  • Ensure you’re getting enough vitamins and minerals.
  • Focus on low-GI foods for sustained energy throughout the day.

 

You don’t need to be a nutrition expert to make healthier choices. By understanding the basics, you can confidently choose your food options, prepare balanced meals, and feel good about what you’re eating.

 
Written by:
Natasha Chittoo

Trainee Doctor

Medical review by:
Dr Nitish Nachiappan MBBS BSc (Hons)

Clinical Director, Myhealthkits

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Published 29 June 2025