PAXboy, that your palate/stomach cannot tolerate many ingredients is one thing, but to to challenge the use of these ingredients in food is a different debate. The bottom line is that no chef in a decent restaurant today is going to send out a bland plate of food. Since top chefs are now involved with producing airline food, I guess the same applies in those kitchens too. So, I can understand and sympathize with your predicament when on board a flight because of course the meal has already been prepared, but don't turn it into a culinary debate
Perhaps, in all seriousness, you should consider requesting a special meal now that a good majority of food doesn't suit you. Equally, perhaps airline chefs should ensure that all flights have a number of "plain" dishes available.