Individuals who are involved in weight training or body building take what is called Meal Replacement Products.

Meal Replacement Products (MRPs) can be either pre-packaged powdered drink mixes or food bars, canned meals, etc. These are used as a replacement for a whole-food meal. MRPs are high in protein, low in fat, have a low to moderate amount of carbohydrates, and contain a wide array of vitamins and minerals.
Many people who are attempting to cut back on food consumption or those who have no time to grab a lunch or need an afternoon boost,
find these beneficial and prevent going without food completely until dinner time.
Not all of these meal replacements are created equal! It is important to read the ingredients on the food label.