Answer: While leeks pack some carbs, they're a garnish, so the amount you use is so a normal meal includes so little that them fit easily into the keto diet.
Each serving of leeks (1 slice) contains 0.7 g of net carbs. If you ate enormous quantities of them, you might find yourself knocked out of ketosis. The normal amount of leeks you'd find in most recipes is so small that the carbs are effectively negligible. Eat them and enjoy!
Serving size: 1 slice
|Net carbs||0.7 g|
|Total carbs||0.8 g|