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The Fast 800 Diet by Dr. Michael Mosley emphasizes consuming around 800 calories a day, which can be quite restrictive. While the diet focuses on nutrient-dense foods, it might be challenging to get all essential vitamins and minerals from such a low caloric intake. Below are some supplements that people on this diet might consider to help ensure they're meeting their nutritional needs:

1. Multivitamin

Taking a comprehensive multivitamin can help cover any gaps in essential nutrients, such as vitamins and minerals that might not be sufficiently obtained from a restricted diet.

2. Omega-3 Fatty Acids

Fish oil or algae oil supplements can provide essential omega-3 fatty acids, which are important for heart health, inflammation control, and brain function.

3. Vitamin D

Since diet alone might not provide adequate Vitamin D, especially in low-sunlight areas, supplementation can support bone health, immune function, and overall well-being.

4. Magnesium

Magnesium is important for muscle function, nerve function, and energy production. Supplementation might be necessary if dietary intake is insufficient.

5. Probiotics

Probiotics can help maintain a healthy balance of gut bacteria, which is important for digestion and overall health, especially when making significant dietary changes.

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The efficacy and necessity of multivitamins can be nuanced, and opinions on them can vary based on different studies and individual needs. Here are some insights based on current research:

1. Meeting Nutritional Needs:
   Multivitamins can help fill nutritional gaps for people whose diets may be lacking in essential nutrients. They can be particularly useful for those who struggle to consume a wide variety of foods, such as individuals following very low-calorie diets like the Fast 800¹.

2. Health Improvements:
   Certain studies suggest that multivitamins can aid specific populations. For example, research has shown that multivitamin supplementation can improve memory in older adults and potentially enhance immune function²³. However, these benefits might not extend to the general population.

3. Chronic Disease Risk:
   The evidence on multivitamins reducing the risk of chronic diseases such as cancer and cardiovascular diseases is mixed. While some studies suggest modest benefits, particularly in reducing the incidence of total and epithelial cancer in male physicians, the overall benefit for the broader population, especially healthy individuals, is less clear⁴⁵.

4. Whole Foods vs. Supplements:
   Whole foods offer more than just isolated vitamins and minerals; they provide a complex array of nutrients and other beneficial substances like fiber and antioxidants. Therefore, a balanced diet is generally preferred over relying solely on supplements⁶.

5. Specific Conditions:
   Multivitamin supplementation may be more vital for certain individuals, such as those with specific dietary restrictions, medical conditions affecting nutrient absorption, or increased nutrient needs (e.g., during pregnancy or periods of heavy menstrual bleeding)¹.

In conclusion, while multivitamins are not necessarily a "scam," their benefits might be more pronounced in certain populations or under specific conditions. For people following restrictive diets like the Fast 800, multivitamins can help ensure that they receive essential nutrients that might be missing from their diet. However, it is advisable to consult with a healthcare provider to determine if multivitamins are suitable for your specific needs.

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