New research has shown that the types of fats people consume in their diet can directly influence the strength and survival of the body’s immune cells. Scientists from the University of Queensland, working with international collaborators, discovered that dietary fats can alter the internal fat composition of T cells, which are critical immune cells responsible for protecting the body against infections and cancer. Their findings, published in the journal Nature, reveal an important connection between diet and immune system performance.
The research team found that diets with a lower ratio of polyunsaturated fatty acids (PUFAs) to monounsaturated fatty acids (MUFAs) help make T cells more resilient and less likely to die prematurely. This discovery provides new insight into how everyday dietary choices may influence immune function.
T cells play a vital role in coordinating the immune response. They help identify harmful pathogens, support the production of antibodies, and attack infected or cancerous cells. According to the researchers, the fats consumed in food can change the lipid composition inside these immune cells. These changes can either strengthen the cells or make them more vulnerable.
Foods rich in PUFAs include fatty fish and soybeans, while MUFAs are commonly found in foods such as olive oil and avocados. The study suggests that a higher presence of MUFAs relative to PUFAs may protect T cells from a specific type of cell death caused by oxidised fats damaging the cell membrane.
This protection is especially important for follicular helper T cells, which assist the body in producing antibodies. Stronger and more stable T cells may therefore improve the body’s response to vaccines. In addition, resilient T cells are better able to multiply and attack tumours, potentially improving the effectiveness of cancer treatments.
Although researchers have not yet identified the ideal balance of these dietary fats, the findings suggest that adjusting dietary fat intake and targeting lipid metabolism could become a simple strategy to strengthen immunity and enhance medical therapies in the future.
REFERENCE: Wang, N., et al. (2026). Lipid metabolism drives dietary effects on T cell ferroptosis and immunity. Nature. DOI: 10.1038/s41586-026-10193-4. https://www.nature.com/articles/s41586-026-10193-4
Study Finds Dietary Fat Ratios Shape Immune Cell Function
