Omega-3 Fish Oil Shows Promise Against Non-Obese Type 2 Diabetes

Researchers at Brazilian institutions funded by FAPESP studied Goto-Kakizaki rats, an animal model for non-obese type 2 diabetes, administering fish oil at 2 grams per kilogram of body weight three times weekly for eight weeks. The treated animals showed lower insulin resistance, better blood sugar control, reduced inflammatory markers, and improvements in cholesterol and triglyceride levels. According to study coordinator Rui Curi, Director of Butantan Institute's Education Center, the fish oil worked by modulating the inflammatory response, changing immune defense cells from a pro-inflammatory to an anti-inflammatory state.

The findings are significant because 10% to 20% of people with type 2 diabetes worldwide are not obese, and their insulin resistance may stem from different biological pathways than obesity-linked cases. While the results come from preclinical experiments in animals rather than humans, recent 2024 and 2025 human studies have shown dose-related improvements in fasting insulin levels and insulin resistance markers with fish oil supplementation. Researchers stress that human clinical trials are still needed to determine ideal dosing and whether omega-3 fatty acids can effectively treat non-obese type 2 diabetes in people.