This is a list of common codes for special airline meals that I believe remain in effect even today, at least for long haul intercontinental travel on foreign legacy carriers. On US carriers these requests may be honored but in my experience they simply take the normal meal and then remove everything that doesn't match the special meal code. So if you order a VGML you might receive a fruit cup, a salad, and a roll instead of a purpose made entree.
- AVML - Asian Vegetarian Meal
- BBML - Baby / Infant Food
- BLML - Bland Meal
- CHML - Children’s Meal
- DBML - Diabetic Meal
- GFML - Gluten-free Meal
- HNML - Hindu Meal
- KSML - Kosher (Jewish) Meal
- LFML - Low Fat Meal
- LSML - Low Sodium Meal
- MOML - Muslim (Halal) Meal
- NLML - Non-Lactose Meal
- VGML - Vegetarian Meal (non-dairy)
- VLML – Vegetarian Lacto-ovo Meal
- VVML – Vegetarian Vegan Meal
Appreciate that. The fact that there are 100,000,000 diabetics in the US (That's one in THREE!), it seems to be a choice that would be better accepted across many cultural and religious boundaries. Atkins, Paleo, Keto all fall into the low carb thing.
It's not just Amtrak. Gluten Free and low fat seem to trump low carb everywhere - grocery stores, restaurants, fast food, etc, and it's understandable. There is almost no other way to hold protein than with a tortilla, bread or a bun. Low carb versions of those are VERY expensive.