Is diet partly responsible for differences in COVID-19 death rates between and within countries?

Citation:

J B, JM A, Laccarino G, Czarlewski W, T H, Anto A, CA A, Blain H, GW C, Cardona V, et al. Is diet partly responsible for differences in COVID-19 death rates between and within countries?. Clin Transl Allergy. 2020;10(16).