When looking into the connection between vitamin D and weight loss, researchers often use supplements in their studies, rather than tracking a subjects sun exposure or food.

Thats because pills are standardized and can be given in high doses to quickly up a study participants vitamin D level. For example, a study published in July 2018 in the International Journal of Preventive Medicine gave subjects who were overweight or had obesity 50,000 IU of vitamin D (an amount well above the recommended limit of 4,000 IU per day, or 28,000 IU per week, per the NIH) each week for six weeks. Researchers found in this small study that the subjects weight, BMI, waist circumference, and hip circumference all decreased significantly, and their vitamin D levels increased significantly, after taking this high vitamin D supplement regime. However, thats not a safe amount of vitamin D to take for weight loss (or any other reason) in the real world.

Although scientists havent done much research on eating vitamin D-rich foods and weight loss, theyre definitely still worth consuming. What we know is that foods high in D tend to be healthy anyways salmon, mackerel, mushrooms, vitamin D-fortified milk, which are part of a healthier diet, versus processed foods so consuming these would likely help with weight loss, says Agarwal.

And while researchers dont typically track sun exposure, getting a little sun the old-fashioned way isnt a bad idea, but its important to not overdose on sun, which can up your risk of skin cancer, according to Harvard Health Publishing.

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Can Taking a Vitamin D Supplement Help You Lose Weight? - Everyday Health