Chances are you're familiar with vitamin D's effects on bone health. Higher levels of the vitamin can help your body support strong skeletal functions, while lower levels can lead to conditions like osteoporosis.
But research over the years has suggested that a lack of this micronutrient may also contribute to unintentional weight gain. Several studies over the past decade have found that women with vitamin D deficiencies were more predisposed to weight gain compared to women with a normal range of the nutrient.
Approximately 42% of adults have a vitamin D deficiency, which means it's fairly common. Other symptoms of the deficiency include fatigue, joint pain, and frequent infections. If you are experiencing any of these in conjunction with weight gain, you might have low vitamin D levels.