If you haven’t read thru this thread already it may provide some insights
as to the food or perception of it by a cross section of crews when working.
Consider the attention the Dietitians and Nutritionist pay to the feeding of the Astronauts when stationed in space for given lengths of time. Then look at the crews aboard ships. What is a good cook ? Someone who can make Paula Dean “yummies” that aren’t necessarily healthy food, (ie greasy foods laden with sugar, fat, and salt) or a cook who understands what constitutes healthy nutrition and what goes on as it passes thru the body so that those he or she feeds can be at their best each day while aboard.
There are other considerations beyond this too. Those who are heavy consumers of alcohol, tobacco, and caffeine, etc may be even more vulnerable. We all enter life with a genetic endowment and medical science is discovering more and more links where people can be predisposed to numerous forms of health issues and where certain things we consume may accelerate those situations. But most cooks can still provide healthy nutritious diets for their family or crew with just some reading & learning.