Vitamin D helps the body absorb calcium and supports other normal functions. It is important to address a deficiency when appropriate, but that is different from taking a supplement to burn fat.
Association is not a treatment effect
Higher body weight is associated with lower vitamin D status in some research. This does not show that low vitamin D is the cause of weight gain. Clinical trials do not support vitamin D supplementation as a weight-loss method.
Sources and individual circumstances
Some foods, including oily fish and fortified products, provide vitamin D. Skin production depends on factors such as season and sun exposure. Do not use one sunlight or supplement rule for everyone, and do not increase unprotected sun exposure to treat a suspected deficiency.
Ask about appropriate advice
A healthcare professional can advise whether testing or supplementation is appropriate for your circumstances and local guidance. Avoid high-dose self-treatment; supplements can cause harm and interact with medicines. A food-tracking app cannot diagnose vitamin D deficiency.
Source: NIH Office of Dietary Supplements: vitamin D, including the weight-loss evidence.
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