Yes they do.
The mechanics of eating and drinking of course (dysphagia) has been a standard aspect for ages,but more and more interest in and consideration of the psychological aspects.
(As an aside,one of the most lasting things we were taught was how it is to be fed or watered by someone else.We had to do it to each other,also adding things like blindfolds and earplugs to simulate sensory issues. Absolutely terrifying and a very sobering experience.)
I have spent a massive amount of time dealing with children with serious eating issues, very similar to those you describe your ds as having..
There is one child I know who eats nothing but cheap chocolate and weird little rice krispie cakes.
We all agree that his communication issues are more pressing than his dietary ones,so his PECS book is full of tiny scanned pictures of all his favourite food.
His mother is also unable to shop in bulk as he will eat everything she buys so on top of her problematic life,she has to go to the supermarket every damned day.
I would hope that in the future we can address his appalling diet.One doesn't need to be a dietician to know that this food is not doing him any good.
I also feel very strongly (going purely on what I experience) that neurologically speaking,a lot of kids with SN are even more sensitive to the chemicals and additives in food than NT ones.
Would also add that obviously people with children with SN who are battling to get thier kids to eat anything are of course not included in my (or shouldn't wonder,anyone else's) psychotic ramblings about only dining on organic chappattis hand milled by virgins on the shores of the Ganges.