A follow on from psulemon's Calorie thread.
There are some people following a low carb diet / lifestyle who eat few or no vegetables, like Tommy in Sweden who often eats one large meat based meal a day with butter and posts them on his blog
. A less extreme Swede is Dr Andreas Eenfeldt who says to eat all the vegetables
you like as long as they grow above the ground. Atkins (US)
has both a 20 and a 40 grams a day plan using "net carbs" (excluding fiber and sugar alcohols) which in the UK is 20g of carbohydrates (we don't lump fibre under carbs) in Phase 1 with 12-15 grams from vegetables
So low carb does not mean no vegetables, although some individuals may make that choice just as there are people that eat high carb with zero vegetables.
The typical "Atkins" vegetables are not only low in carbohydrate content, but the GI of that carbohydrate is also very low -
Green beans 3.2
Brussels sprouts 4.1
Savoy cabbage 4.1
Romaine lettuce 1.7
So one can eat 200 grams of veg (half of the WHO's "five a day") and take in less than 10g of carbohydrate, with a blood sugar impact equivalent to 2 grams of glucose or less. My n=1 experience of this is that a typical "meat and two veg" low carb meal accompanied by a glass of dry wine has literally zero effect on my blood sugar level measured continuously.
I propose that eating a low carbohydrate diet, even a ketogenic diet, is entirely compatible with vegetable consumption although obviously one has to avoid / limit the higher starch or sweeter root veg.