The types of fats we consume directly impacts the survival and strength of the body’s immune cells and ability to fight disease, researchers have found. 

A University of Queensland team led an international collaboration that found diet could change the fat composition inside T cells. 

Professor Di Yu of UQ’s Frazer Institute said the research showed a diet with a lower ratio of polyunsaturated fatty acids (PUFAs) to monounsaturated fatty acids (MUFAs) makes T cells much more resilient and resistant to cell death. 

“The findings mark a profound leap in understanding of how our diet directly impacts immune system function,’’ Professor Yu said. “The kinds of fats you eat change the fat composition inside your T cells and those changes can make T cells either weaker or stronger in terms of immune protection.’’ 

Examples of foods high in PUFAs include fatty fish and soybeans, while MUFAs include olive oil and avocadoes. 

Professor Yu said T cells were vulnerable to a type of cell death that occurred when oxidised fats build up and destroy the cell’s outer membrane. “When T cells are protected from this oxidation-induced cell death, specific T cells (called follicular helper T cells) become much better at assisting the body in producing antibodies, which could suggest enhanced vaccine protection,’’ he said. 

“Stronger, more resilient T cells are also better at multiplying and actively attacking tumours. Experimental models demonstrate that dietary fat modifications could improve the success of cancer treatments which could help eliminate tumours and significantly prolong survival. 

“In future, optimising a patient’s diet and targeting lipid metabolism could become an easily accessible way to enhance our immunity. This could represent a powerful approach, used alongside vaccines or cancer immunotherapies, to ensure immune cells are strong enough to fight off disease.’’