Very low calorie foods are also known as 'FREE' FOOD and are allowed relatively unlimited on diets. Some common free foods include celery, non-starchy vegetables, and low calorie items like yogurt and salsa. However, the document warns that while labeled free, eating these foods in excess without tracking calories can undermine weight loss efforts. It provides a calorie breakdown of sample free foods and warns that over 500 calories of free foods a day can add up and impact weight loss. Moderation is key with free foods to aid rather than hinder dietary goals.