Many popular diets for weight loss include purchasing products to replace your every day meals, or including weight loss shakes, bars, and pre-made meals into your diet. Some of these companies include the Zone, Jenny Craig, Atkins, or the Slim fast Diet. However, committing to a plan can be costly, and the initial payments steep. before investing, contact the company and ask to try a sample of the products before you commit. Many companies are happy to do so, and you can try free diet samples before deciding which ones tastes best, and seems the most manageable, before you pay the enrollment fees or buy the foods in bulk.