The alteration of circadian rhythms due to the habits of modern life is associated with an increase in visceral fat, BMI and an altered lipid profile (low HDL and high triglycerides). It also produces mitochondrial dysfunction, altering the beta-oxidation of fatty acids, increases the risk of insulin resistance because it decreases the capacity of the beta cells that produce insulin, producing glucose intolerance and, consequently, an alteration in blood pressure. On the other hand, exposure to the full spectrum of sunlight, reduction of artificial light at night, food intake during the day and exercise are able to restore endogenous circadian rhythms and reverse all metabolic parameters. These tools can impact central and peripheral circadian clocks, such as those of muscle, adipose tissue and liver, restoring them and, therefore, significantly improving glucose tolerance, reversing insulin resistance and weight gain, reducing fat tissue and allowing to achieve a healthy and aesthetic body.