It has the most direct effect on the risk of contracting avoidable degenerative, and life-shortening diseases. This can be through poor nutrition or, increasingly nowadays, becoming overweight or obese.
The consequenses of this can be development of heart disease, stroke, and diabetes.
If a healthier life is desired, one's whole lifestyle must be addressed.
All aspects of one's life must be dealt with -
daily activity, exercise, stress, nutrition, psychological health, social relationships, support etc.
Initially, the psychological aspect needs to be addressed.
If one's desire for change comes from within, there is a genuine chance of success.
Focussing on support, 'self-efficacy' (self-help) and coping with relapse are essential strategies for success.