Omega-3 and omega-6 fatty acids both belong to the group of polyunsaturated fatty acids. They are natural components of many foods and are found in both plant and animal sources. People often talk not only about the absolute amount of these fatty acids, but also about their ratio to each other. This ratio plays a central role when considering modern eating habits.
Common properties, different sources
Both omega-3 and omega-6 fatty acids have similar basic chemical structures, but differ in the position of their double bonds and therefore also in their physiological effects. In practice, this means that they are found in different foods. Omega-6 fatty acids, which tend to promote inflammatory processes in the body, are mainly found in many vegetable oils, including sunflower oil, corn oil and soybean oil. Omega-3 fatty acids, on the other hand, which are thought to have predominantly anti-inflammatory properties, are found in linseed, walnuts, rapeseed oil and fatty marine fish.
As a result of this different distribution, a significantly higher proportion of omega-6 fatty acids has become established in many modern diets, as vegetable oils are widely used in food production. A balanced ratio of omega-6 to omega-3 is therefore considered nutritionally sensible.
Focus on the relationship
The ratio of omega-3 to omega-6 describes the ratio of these two fatty acid groups within the diet. Historical diets, which relied more heavily on unprocessed foods, often had a more balanced ratio. In today’s dietary patterns, the focus is often on highly processed products that contain predominantly omega-6-rich fats.
An unbalanced ratio is not necessarily caused by a lack of omega-3, but often by a high intake of omega-6 fatty acids.