The negative calorie is a myth, but even doctors fall toward these concepts.

Celery = Bleh!
If Ihad to lose weight , watermelon would be my choice and swimming... maybe two birds one stone and swim in a pool of watermelon

I thought maybe cardboard, indigestable cellulose, something that we can not in any way draw calories from, may use some in the digestion process.

Celery? Mostly water and fiber.

Something which requires more energy to digest than it provides. It's a theoretical possibility but I don't really have any interest in food... The science of it that is!

I always figure a little food poisoning will help you lose a few calories.

Ice is the only thing that comes to mind that could have negative calories because water has 0 calories and it requires physical effort to consume it. In theory you could burn a calorie or 2 eating ice.

Well, damn. All that celery consumed, for naught. LOL

@ScienceBiker great info. Only question is why is he offering free supplements on a link I reached? Are they reputable? Really free? Thanks for quick response David.

Celery - takes more calories to consume than it provides