According to the Mayo Clinic, people who are deficient in vitamin D are more likely to develop Alzheimer's disease or other forms of dementia later in life. However, it's not yet clear whether taking vitamin D supplements or spending more time in the sun could lower the risk of developing Alzheimer's disease. MORE: Eating these foods can help you get your daily dose of vitamin D While we know that vitamin D is essential to help the absorption of calcium to strengthen and protect bones, researchers are unsure of any role it may play in brain health. Studies have found that it may be involved in many cognitive functions, but exactly how and why remains unknown. As a person ages, their ability to synthesize vitamin D from UV rays through their skin diminishes, so it's advisable for older people to ensure they include plenty of foods that are rich in vitamin D, such as oily fish, fortified cereals and dairy products in their diet for overall health. The recommended dose of vitamin D each day for a person under the age of 70 is 600 IUs and 800 IUs for those over the age of 70. MORE: Can head injuries cause Alzheimer's disease? Alzheimer's News Today is strictly a news and information website about the disease. It does not provide medical advice, diagnosis or treatment. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.