Doing this with celery will be more difficult as it takes more energy to digest than is gained from it.
I had a humorous image in my mind of someone trying to get fat via only veggies, imagine the volume of food they would have to eat every day!
Examples: The Kimchi I had with lunch was 15 calories, the half bag of russels sprout I had last night (excluding the oil oil cooked in) 130 calories.
Edit: Why the downvote?
I'm not one of the downvoters, but "satiety of eating unrestricted quantities of vegetables outweighs any caloric intake" approach only works if you don't add fats or sugar sauces.
I was responding to someone talking about eating "raw celery". Vegetables in general are low in calories (before as you and I mentioned, oil sugar etc are added), BUT raw celery is well known to have a net negative impact.
https://en.wikipedia.org/wiki/Celery#Nutrition https://en.wikipedia.org/wiki/Negative_calorie_food
It's a common misconception.
Btw, why would you create a user name just to post the above?
- Eat like my skinny indian friend. He takes a bite, chews it for quite a while, and then take another bite about a few minutes later. He doesn't do this on purpose, it's completely habitual. Such a slow eating speed really helps him stay skinny.
- Stop snacking on high calorie nuts, chips and bars. If you just habitually nibble on food that is in front of you until it's gone, recognize that and don't put food infront of you.