Table of contents
Nutritional table: canned sardines in olive oil (100 g drained)
| Nutrient | Amount | % RDI |
|---|---|---|
| Calories | 208 kcal | ~10% |
| Protein | 24.6 g | 49% |
| Total fat | 11.5 g | 16% |
| — Omega-3 (EPA+DHA) | 1.5 g | Excellent |
| — Saturated | 1.5 g | 8% |
| Calcium | 382 mg | 38% |
| Iron | 2.9 mg | 16% |
| Vitamin D | 4.8 µg | 24% |
| Vitamin B12 | 8.9 µg | 371% |
| Selenium | 52.7 µg | 96% |
| Phosphorus | 490 mg | 70% |
| Niacin (B3) | 5.2 mg | 33% |
| Sodium | 505 mg | 22% |
| Cholesterol | 142 mg | 47% |
Calcium from bones: what the dairy industry doesn't want you to know
Canned sardines are eaten with their bones. And these bones, softened by the sterilization process (121 °C for 45-60 minutes), are an exceptional source of calcium: 382 mg per 100 g.
For context: a glass of whole milk (200 ml) contains 240 mg of calcium. A serving of canned sardines (80-100 g) gives you more calcium than a glass of milk. And with better bioavailability, because the calcium from the bones is accompanied by phosphorus and vitamin D, which facilitate its absorption.
This is especially relevant for lactose intolerant people (40% of the adult Spanish population), vegans who reintroduce fish, or postmenopausal women who need to strengthen bone density.
A meta-analysis published in Osteoporosis International (2017) found that calcium from food sources was associated with better bone density than calcium supplements. Sardines are one of those food sources.
Omega-3: sardines compete with salmon
With 1.5 g of EPA+DHA per 100 g, canned sardines are among the foods with the highest density of omega-3 on the market.
| Food | Omega-3 (EPA+DHA) per 100 g | Approx. price per 100 g | € per gram of omega-3 |
|---|---|---|---|
| Fresh salmon (farmed) | 2.1 g | 1.50 € | 0.71 € |
| Canned sardines (olive oil) | 1.5 g | 0.40 € | 0.27 € |
| Canned mackerel | 1.3 g | 0.35 € | 0.27 € |
| Canned albacore tuna | 0.9 g | 1.20 € | 1.33 € |
| Omega-3 capsules (supplement) | 0.6 g/capsule | 0.15 €/capsule | 0.25 € |
Sardines are the most economical source of omega-3 along with mackerel. And unlike supplements, they come with protein, calcium, B12, and vitamin D included in the package. No supplement can replicate that complete nutritional profile.
Furthermore, sardines accumulate almost zero mercury (0.013 ppm according to the FDA). They are small fish that are low on the food chain — they don't have time to bioaccumulate heavy metals. It's the cleanest omega-3 you can consume.
Sardines vs canned tuna: the comparison that matters
| Nutrient (per 100 g drained) | Sardines in olive oil | Light tuna in olive oil | Winner |
|---|---|---|---|
| Calories | 208 | 198 | Similar |
| Protein | 24.6 g | 25.5 g | Tuna (marginal) |
| Omega-3 | 1.5 g | 0.3 g | Sardine (5x more) |
| Calcium | 382 mg | 11 mg | Sardine (35x more) |
| Iron | 2.9 mg | 1.4 mg | Sardine |
| Vitamin D | 4.8 µg | 1.7 µg | Sardine |
| B12 | 8.9 µg | 2.2 µg | Sardine |
| Selenium | 52.7 µg | 90.6 µg | Tuna |
| Mercury (ppm) | 0.013 | 0.128 | Sardine (10x less) |
| Price/can | 2-4 € | 1-3 € | Similar |
Verdict: Sardines win in omega-3 (5 times more), calcium (35 times more), iron, vitamin D, B12 and mercury (10 times less). Tuna wins in selenium and neutral flavor (more versatile in salads). Nutritionally, sardines are objectively superior. It's not opinion — it's data.
Quality sardines make all the difference. From small sardines in extra virgin olive oil to smoked sardines — discover our selection of premium sardines and small sardines.
How to choose good canned sardines
Not all cans of sardines are created equal. Here's what makes the difference:
1. Species: Look for Sardina pilchardus (European sardine). It has the best flavor and texture. Some cheap cans use sardinella (Sardinella spp.) from tropical waters — more bland and softer texture.
2. Size: Small sardines (8-12 cm) are more tender and have fewer bones. Large sardines (15-20 cm) have more flavor but the bones are more noticeable. Both are good — it's a matter of preference.
3. Oil: EVOO > olive oil > sunflower > "vegetable oil". The oil in the can infuses with the sardine juices and becomes an excellent seasoning. With EVOO, that liquid is gold.
4. Number of pieces: A can with 3-4 whole sardines indicates selected pieces. A can with 8-10 tiny pieces may be a discarded product.
5. Cannery: Canneries in northern Spain (Galicia, Cantabria, Basque Country) have centuries of tradition. Brands like Güeyu Mar, Olasagasti, Conservas de Cambados or Los Peperetes are benchmarks.
Olive oil matters more than you think
A sardine in extra virgin olive oil and one in sunflower oil are nutritionally two different products:
With EVOO: The oil provides polyphenols (antioxidants), oleic acid (heart-healthy) and a flavor that complements the sardine. In addition, the omega-3 from the sardine partially dissolves in the oil — that oil in the can has omega-3.
With sunflower oil: Oil rich in omega-6, which in excess is pro-inflammatory. It does not provide significant polyphenols. The flavor is neutral — it neither adds nor detracts.
Economic fact: The price difference between sardines in sunflower oil (€1.50) and in EVOO (€3-4) is €1.50-€2.50. That difference buys a quality oil with real nutritional value. It is the most profitable investment in the canned goods aisle.
Canned sardines are the foundation of a smart pantry. Combine them with our gourmet canned goods collection to always have quality options ready to serve.
Keep exploring
Mussel properties · Salmon: complete nutritional value · Canned tuna: comparison · Sardines and small sardines
Frequently asked questions
Can you eat the bones of canned sardines?
Yes, and you should. The bones soften during sterilization (121 °C, 45-60 min) and are perfectly edible. They are the main source of calcium in canned sardines — 382 mg per 100 g, more than a glass of milk.
How many cans of sardines can I eat per week?
3-4 cans per week is perfectly safe for adults. Sardines accumulate minimal mercury (0.013 ppm). The limiting factor is sodium: each can has 400-600 mg. If you have hypertension, limit to 2-3 cans and choose "low sodium" versions.
Do canned sardines make you gain weight?
208 kcal per 100 g with 25 g of protein and 1.5 g of omega-3. It is a dense and satiating nutritional profile. In the context of a balanced diet, sardines do not make you gain weight — they are one of the foods with the best nutrient/calorie ratio available.
Which is better: sardines in oil or natural?
Natural ones have fewer calories (150 vs 208 kcal) but also less omega-3 (part is lost with the liquid). In extra virgin olive oil, they are nutritionally superior: EVOO provides polyphenols and oleic acid, and omega-3s are better preserved in a fatty medium.
Do sardines contain mercury?
Practically none: 0.013 ppm, the lowest level among common fish. They are small, short-lived fish, low on the food chain. It is the safest fish you can eat regarding mercury.
Do canned sardines have calcium if I remove the bones?
If you remove the bones, you lose almost all the calcium. Sardine meat without bones has only 40-50 mg of calcium per 100 g. The bones provide the remaining 330+ mg. Eat the bones — they are soft and you won't notice them.
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