This book is the first part of the series, Longevity Mystery Solved, which covers Body Types, Western Systems that were previously discussed in my book, "Control for Life Extension. A Personalized Holistic Approach," first published in 2001. It aims at the understanding of your body and personality type, which allows you to apply the factual information in my books and others of this kind with better understanding. Knowing more about ourselves increases our consciousness and awareness, and can have a profound effect on our entire life. Regarding body and personality types related to longevity you will learn the following:1. Somatotypes. Excessively long-lived people (i.e., centenarians) usually belong to the endomorphic mesomorphs. If a person belongs to the endomorph type and is overweight, they would do better to undertake diet and exercise measures to transform their body into the mesomorph type. Extremely underweight ectomorphs need to gain weight by doing strength exercises and eating more carbohydrates.2. Personality Types. Type B behavior promotes longevity; therefore, Type A and Type C personalities must control their personality traits and move in the Type B direction.3. Instincts. The egophylum type, which represents the self-preservation instinct-careful, egocentric, suspicious, non-adventurous, and sober-minded, is often found among centenarians. The reproduction instinct is very strong in most centenarians; many of them had several children. The altruistic instinct promoted the longevity of many centenarians. The research instinct, driven by curiosity, is also a characteristic of many centenarians. The freedom instinct is quite strong among long-living people as well. The preservation of dignity, which is aligned with the freedom of thought and speech, definitely manifests itself in some centenarians.4. Temperaments. A phlegmatic temperament promotes longevity. Cheerful, inspiring, optimistic, and lively sanguine people are found among centenarians quite often. Aggressive, adventurous, repressive, and stubborn people of the choleric temperament tend to live less than the average life expectancy, although other qualities of this temperament-such as forcefulness, dominance, and self-confidence-are found to be factors that increase longevity. People with a melancholy temperament type and who are faithful and suspicious are some of the qualities of centenarians. However, because they are resentful and unforgiving, they harm their health and decrease their longevity.5. Blood Types. Among the many factors affecting longevity, blood type seems to be the most influential, which is why I used it as the dominant factor to determine the personalized diet. Many centenarians in Western countries have blood type O; blood type B is predominant in the Oriental countries namely China, Japan, Korea, Singapore, etc. People with blood type A have the lowest life expectancy and are vulnerable to cancer and heart diseases; therefore, they must follow a healthy diet and lifestyle. Compared to people with blood type A, type Os and type Bs have more chances to achieve longevity under similar conditions. In relation to coronavirus COVID-19 disease, blood type A and AB are at higher risk to die or encounter thromboembolic events such as respiratory failure, thrombosis, deep vein thrombosis, and Pulmonary Embolism (PE) due to elevated coagulability than blood type O and B.6. Metabolic Types. The metabolic-type approach helps us to better understand certain traits of long-living people, such as drinking and smoking. These habits are universally regarded as unhealthy, but they seem to do no harm to some centenarians. Good examples are world-longevity champion Jeanne Calment, of France, who lived to be 122 and American comedian George Burns, who lived to 100. Their habit of alcohol-drinking and smoking, increased their metabolic rate and were beneficial to their health.