No matter what the fad diets may claim, there is just no way you can rule out these two very crucial factors. However, to up the pace of weight loss process, there are a few diet hacks that you can practice during bedtime. These hacks are simple yet can help you lose weight fast by increasing the body's metabolism and boosting your digestion process. Most of these statements are marketing taglines that are at best based on anecdotal evidence. Most research defines a VLCD as consisting of 450–800 calories per day. This number is comparable to that of some popular weight loss cleanses.