Drinks as well as food has calories
Calories come from all foods and drinks, except from water.
Fat has over twice the calories of carbohydrates or proteins per gram, so foods that are high in fat, such as butter, meat, sour cream, cheese, ice cream, etc. tend to have a lot of calories per gram.
Lattes are drinks, and while they do have some calories in them they don't really qualify as a substantial source of food.
No calorie foods (well, drinks, really) are water, diet sodas, some powdered juices / drinks, most teas, and some coffees. Foods will almost always have some calories in it. Food with less than 10 calories are ice chips, one cup of lettuce, gum, and some powdered juices / drinks.
It is a myth that any food can "burn" calories. In fact, all foods and drinks (except for water) have caloris in them. A celery stalk has about 6 calories in it.
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All foods and drinks, except for water, have calories in them.
Diet drinks usually have no calories in them.
Zero means Zero calories Diet means less calories
Drinks and edibles, although you can gain fat calories by starving yourself.
It's food that is unhealthy or has low nutritional value and/or high calories or fats. Examples: candy, trans-fat fast foods, sweet drinks, and others.