Whether you’re counting carbs, calories, caffeine, or a host of other important nutritional metrics, the Health app makes it easier to manage your goals and watch exactly what you eat. Third-party apps can help you keep a closer eye on every meal, and since all the data is displayed in Health, you’ll always know if you’re getting the nourishment you need.
Health, as defined by the World Health Organization (WHO), is "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." This definition has been subject to controversy, as it may have limited value for implementation. Health may be defined as the ability to adapt and manage physical, mental and social challenges throughout life.