Yes, eating healthy food reduces most of the negative effect of stress on our body, it is said by a senior research scientist at Abbott(Matthew J. Kuchan, Ph. D.,).
Healthy food like Nuts, Dark Chocolates, curds, green vegetables and many more. You need to just add these items in your food char on a regular basis then you are able to reduce your stress. Doing regular exercise is also good for reducing the level of stress.
Here are the detail information available just read: https://healthgroovy.com/foods-to-reduce-stress-and-cortisol-levels/