Quick answer: Bonito del Norte belly provides 220-280 kcal per 100g drained, with 22-26g of protein and 14-20g of omega-3 rich fat. It does not cause weight gain in normal portions: a tapas portion (60g) adds 130-170 kcal. It has more fat than light tuna because it comes from the belly area, but this fat is what provides flavor and omega-3.
What bonito belly is
Ventresca, or bonito belly, is the ventral area of the Bonito del Norte (Thunnus alalunga), located just below the gills. Being fattier than the loin, it concentrates flavor, juiciness, and omega-3 EPA/DHA. It is generally sold in olive oil.
Calories and macros of bonito belly
| Per 100g drained | Bonito belly | Bonito loin | Light tuna |
|---|---|---|---|
| Calories | 220-280 kcal | 175-210 kcal | 110-140 kcal |
| Protein | 22-26 g | 26-29 g | 24-26 g |
| Fat | 14-20 g | 8-12 g | 1-3 g |
| Omega-3 | 2-2.5 g | 1.2-1.5 g | 0.5-0.8 g |
Nutritional values taken as approximate ranges according to BEDCA (Spanish Food Composition Database) and USDA FoodData Central. Exact figures vary by origin, cut, preservation, and preparation method.
Does it cause weight gain? An honest answer
No, in reasonable portions, it does not. Bonito belly is denser than light tuna, but also more satiating and richer in omega-3.
A tapas portion (60-70g) provides 130-170 kcal, equivalent to a whole yogurt. That same portion with two slices of white bread can rise to 300-350 kcal.
Bonito del Norte Belly 120g - Olasagasti Traditional Cantabrian piece, low in mercury (small species), high in omega-3. Premium tapas. View product →Bonito belly vs. light tuna: which causes less weight gain?
Light tuna has approximately half the calories of bonito belly, but also less omega-3 and less flavor. For strict low-calorie diets, light tuna loin is more efficient. For a balanced diet with a focus on good fats, bonito belly compensates with its omega-3 profile.
How to include it in a healthy diet
- Portions of 50-80g drained.
- In warm salads: replaces cheese, adds flavor without skyrocketing calories.
- On whole-wheat toast with tomato: a healthy sandwich of 280-320 kcal.
- 1-2 times a week: within EFSA recommendations for oily fish.
Myths about bonito belly
- "It has too much fat": 14-20g/100g, but >70% are healthy unsaturated fats and omega-3.
- "It's red tuna belly, so it causes more weight gain": no, most commercial bonito bellies are from Bonito del Norte, a small species low in mercury.
- "The oil makes you gain weight": draining it well reduces 30-40 kcal per serving.
How many calories does bonito belly have?
Is bonito belly healthy?
Does it cause more weight gain than light tuna?
How much bonito belly per portion?
Does it contain mercury?
Is it good for diets?
How much protein does a can provide?
Does bonito belly in oil contain preservatives?
Discover our premium selection
Carefully selected seafood products since 1990 at Mercat del Ninot, Barcelona. Refrigerated shipping in 24-48h.
