The phrase negative calorie food is used to refer to foods that require more energy to digest than they provide nutritionally. Although no food can actually have negative calories, some foods provide extremely few. If these foods require more energy than they provide to digest, the effect of consuming them results in a net energy loss.Low nutrient, high cellulose foods like celery are generally agreed to consume slightly more energy to digest than they provide nutritionally. These foods may be consumed within a weight-loss diet to potentially relieve the feeling of hunger without contributing to total caloric intake. Limiting a diet to only these foods could result in malnutrition.There are claims that some foods require more energy than others to digest, but there is currently no evidence to support this. Many vegetables and fruits promoted as "negative calorie" contain more calories than are consumed in digestion, but they may have a low amount of calories relative to the amount of satiation they provide. References^ http://www.snopes.com/food/ingredient/celery.asp

Recent studies from from the ongoing Framingham Nutrition reported that women who ate almost 400 fewer daily calories but chose the least nutritious foods had a 2 1/2 times higher risk of abdominal obesity than those who ate that much more but made better choices.

It is great to have healthy food at home, but unless you are on house arrest, there will be times when you need to leave the house. By having these two things easily accessible at places where you spend a lot of your time, you enjoy these two important benefits: 1. you save money from having to buy snacks and 2. you can control your calories

lists the different low cal foods under 100 cals from 0 water to 99 lemon grass

One of the most common food choices for the average person is fast food. And, as if this is going to be a shock to anyone on the planet, fast food is one of the worst high calorie offenders. This list is taken from the nutrition facts of literally every single item from the menus of 25 popular fast food restaurants.

The Four Major Warning Signs of Eating Insufficient Quantities of Fresh Fruit by Dr. Doug Graham. Raw vegans tend to get their calories from heavy foods, like nuts, seeds, avocados and oils, but this is a sure recipe for failure. Here is a great blog for raw vegans encouraging them to get their calories from fresh fruits. Serious humor!