Healthy diets - why?

Having a healthy diet is one of the most important things you can do to help your overall health. Along with physical activity, your diet is the key factor that affects your weight.
Having a healthy weight for your height is important.
Being overweight or obese increases your risk of heart disease, type 2 diabetes, high
blood pressure, stroke, breathing problems, arthritis, gallbladder disease, sleep apnea (breathing problems while sleeping), osteoarthritis, and some cancers.

You can find out if you're overweight or obese by figuring out your body mass index (BMI). Women with a BMI of 25 to 29.9 are considered overweight, whereas women with a BMI of 30 or more are considered obese. All adults (aged 18 years or older) who have a BMI of 25 or more are considered at risk for premature death and disability from being overweight or obese.