Gateway vegetable refers to a palatable vegetable that encourages more adventurous vegetable consumption.
Healthy eating and weight loss requires vegetables. There's no way around it. Some of us though would rather fill our plates with meat and bread. If you discover a "gateway vegetable" you'll start eating them more often.
Experts suggest finding one vegetable to introduce into your diet if you're a vegetable hater.
Once you find that one vegetable you like, you can branch out from there. It's a way of changing a small eating habit and recognizing that you don't have to stick to your belief that you'll never eat vegetables.
Preparation matters too: try grilling them instead of boiling or steaming.