Canned Tuna in Water
Every 100 g of Canned Tuna in Water contains 116 kcal and 26 g of protein. Because it has less than 5 g of available carbohydrate per 100 g, the glycemic index does not apply and its direct effect on blood sugar is minimal.
Medically reviewed by Dr. Wassim Habib · Last reviewed 12 October 2026
Glycemic index
Glycemic load
Calories
Protein
💡 Smart Nutritional Guidance
Consumption advice
Tuna canned in water is a practical, low-calorie protein source that suits salads and sandwiches.
Best preparation methods
Drain it well and mix it with a little olive oil and lemon instead of mayonnaise.
Important Nutritional Note
This food does not need a glycemic index, but the foods eaten with it determine the meal’s effect on blood sugar.
Nutrition facts
| Nutrient | Per 100 g | Per typical portion (100 g) |
|---|---|---|
| Calories | 116 kcal | 116 kcal |
| Protein | 26 g | 26 g |
| Carbohydrate | 0 g | 0 g |
| Available carbohydrate | 0 g | 0 g |
| Fat | 0.8 g | 0.8 g |
| Dietary fibre | 0 g | 0 g |
| Insulin index | 49 · clinically tested (Holt / Bao) | |
The typical portion is approximate, for comparison purposes.
Comparison & smarter alternatives
It provides 22.4 g of protein per 100 kcal, ranking 1 of 6 in Meat, fish & eggs (highest first).
Other foods in this group:
Frequently asked questions
Is Canned Tuna in Water good for weight loss?
It can be a useful part of a weight-loss plan because it provides 22.4 g of protein per 100 kcal, and protein supports fullness. A 100 g portion gives 116 kcal.
How does Canned Tuna in Water affect blood sugar?
Canned Tuna in Water contains virtually no available carbohydrate, so the glycemic index does not apply and its direct effect on blood sugar is minimal. The meal’s effect depends on what you eat with it, such as bread, rice or sweetened sauces.
What is the nutritional value of a typical portion of Canned Tuna in Water?
A typical 100 g portion of Canned Tuna in Water provides about 116 kcal, 26 g protein, 0 g carbohydrate, 0.8 g fat and 0 g fibre.
Disclaimer: This guidance is for nutritional lifestyle orientation and does not constitute a diagnostic medical device under EU Regulation MDR 2017/745.