Yes, eating nuts every day can help you live longer. A study analysing data from 20 studies around the world, involving more than 800,000 participants concluded that around a handful of nuts each day can reduce the risk of death from respiratory diseases, diabetes, infections, and all-causes, as well as reducing the risk of developing heart disease and cancer [1].

Eating nuts can help you live longer by reducing the risk of developing diseases as well as reducing the risk of death from particular diseases. 

An extensive systematic review and meta-analysis led by the Imperial College London and the Norwegian University of Science and Technology, investigated the effect of nut consumption [1]. The results showed a 24%, 11%, 19%, 18%, and 19% reduction in the relative risk of coronary heart disease, stroke, cardiovascular disease, total cancer, and all-cause mortality with a higher nut intake, respectively. In the dose-response analysis there was a 29%, 7%, 21%, 15%, and 22% reduction in the relative risk for a one serving per day increase in nut intake (one serving = 28g), respectively.