A person's health can be greatly influenced by a range of lifestyle or health-related habits (behavioral variables). Smoking, drinking, a bad diet that leads to obesity or malnutrition, a lack of physical activity, sexual behavior, and drug-related disorders are all examples of ill health. Health professionals have long known that unhealthy behaviors increase a person's risk of disease and other problems now facing today's society such as obesity and AIDs. Healthy behaviors help keep individuals free from many diseases and disabilities, maintain them at their best possible mental and physical state, and extend their lives. Changing one's lifestyle to live more healthfully is therefore important for maintaining good health. In addition to personal hygiene practices such as washing your hands regularly or not at all, exercising, eating well, and getting enough sleep, there are several other factors related to lifestyle that influence health. For example, smoking, drinking alcohol excessively, using drugs, having multiple sexual partners, not taking care of yourself, and working in a job that requires you to sit down most of the day are all behaviors that will negatively impact your health. Lifestyle choices also play an important role in determining how quickly you will age and how likely you are to suffer from certain diseases as you get older.