Why do you need to read this book? Medicine is still making fundamental discoveries that can prolong life, but long-term, daily behavioral change—including reducing risky behaviors and making changes in exercise and nutrition—is the key to adding years and quality to our lives. An often-cited rule of thumb in behavior modification is that it takes about 21 days—one month—to break an old habit and replace it with a good one. But that leaves the question: What's the best way to remind someone to maintain these three changes for 21 days? This book offers a simplified set of suggested changes that you can choose from and design a healthy eating plan that fits your lifestyle. It also includes printable and reusable spreadsheets. We also provide spaces to write down your goals and evaluate them regularly. The Messenger of God, may God bless him and grant him peace, said: “The son of Adam has not filled a vessel worse than his stomach. It is sufficient for the son of Adam to eat a few mouthfuls to maintain his backbone. If he must, then a third for his food, a third for his drink, and a third for his breath.”