Summary
Dr. Berg makes the case for including sardines as a staple food on a ketogenic diet, highlighting their dense nutritional profile including omega-3 fatty acids, high-quality protein, and multiple micronutrients. He also shares a personal account of laboratory testing he conducted to verify the DHA and EPA content of canned sardines.
Key Takeaways
- Sardines are highly compatible with keto due to their combination of healthy fats, quality protein, and dense micronutrient content
- Canned sardines do retain significant DHA and EPA despite the heating process involved in canning — confirmed through lab testing Dr. Berg personally funded ($4,000)
- Wild-caught Pacific sardines are the recommended variety for best quality
- Eating sardines with bones provides a good source of calcium and phosphorus
- Eating sardines with skin maximizes omega-3 intake, as fats are concentrated in and around the skin
- Sardines are a strong source of vitamin D3, vitamin B12, selenium, zinc, and B vitamins
Details
Why Sardines Work Well on Keto
Sardines naturally align with ketogenic macronutrient goals by providing a high-fat, moderate-protein profile with virtually no carbohydrates. The healthy fats present support ketosis while the protein content contributes to satiety and muscle maintenance.
The DHA/EPA Lab Testing Story
Dr. Berg initially believed that the canning process — which involves heat — would destroy or significantly reduce the omega-3 fatty acids DHA and EPA in sardines. He invested $4,000 of his own money to send sardine samples to a laboratory for analysis. The results contradicted his assumption: canned sardines were confirmed to contain a meaningful amount of both DHA and EPA, making them a reliable source of these essential fatty acids even in canned form.
Recommended Type
Dr. Berg specifically recommends wild-caught Pacific sardines over other varieties. Wild-caught fish generally carry a cleaner nutritional profile and lower risk of contaminants compared to farmed alternatives.
Bones and Skin — Don’t Skip Them
- Bones: Sardine bones are soft and fully edible. Consuming them adds a notable amount of calcium and phosphorus to the diet, supporting bone health.
- Skin: The skin and the tissue directly beneath it are concentrated sources of omega-3 fatty acids, so leaving the skin on maximizes the nutritional benefit.
Full Micronutrient Profile
Sardines provide a broad spectrum of nutrients in a single food:
- Omega-3 fatty acids (DHA and EPA) — support cardiovascular and brain health
- Vitamin D3 — important for immune function and calcium absorption
- Vitamin B12 — essential for neurological function and red blood cell production
- Calcium and phosphorus — bone and cellular health (from bones)
- Selenium — antioxidant mineral
- Zinc — immune and metabolic support
- B vitamins — energy metabolism