The breakdown is simple: 80 percent of the time you focus on eating clean, good-for-you foods, and 20 percent of the time you have the freedom to indulge as you please. Don't be concerned about the math, but it's simple: if you eat three square meals a day, three of those meals every week are your 20 percent cheat meals; if you eat five small meals a day, then seven of those small meals are up for grabs.