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  • Healthfulness when eating a raw, vegan diet is a challenge though it's not inherent. You have to make sure you're getting enough protein, iron, calcium, and other vitamins and minerals like B12. Because most people who eat raw foods exclude animal products, you may need to take vitamin supplements to make up for any gaps in your diet.
  • Raw food diets tend to suggest that meat should be avoided and that nuts and seeds should be eaten in its place. Although these do contain protein, they don't contain as many different amino acids as meat does — and so a greater number of vegetable and nut products need to be eaten to make up the same number of amino acids (these acids make up what we know as protein).
  • Eating cooked foods with raw foods can also lead to indigestion, as different stomach acids are produced. A high-fibre diet, and particularly if your guts are not used to it, may also lead to excessive flatulence, which can be socially embarrassing and uncomfortable. Some people may also feel uncomfortable with increased visits to the toilet.
  • Fruit and vegetables often have pesticide residues on them and, as your intake will be stepped up, it is likely that your liver will have an additional load on it from these pesticides. Buying organic fruit and vegetables will be helpful, though the cost of these may send your supermarket costs soaring. Always wash or peel your fruit and vegetables, as appropriate.
  • Although fruit, vegetables, nuts and seeds have enormous variation, the diet is still quite restrictive — making it more likely that you will get bored and stop doing the regime. In addition, some components of fruit and vegetables are better absorbed if cooked — such as lycopene in tomatoes, which has been shown to be beneficial in preventing prostate cancer in men. Plus, cooking isn't all bad. It boosts some nutrients, like beta-carotene and lycopene. It also kills bacteria, which helps you avoid food poisoning.

This information has been sourced, in part from: Web MD.  Health and Well Being.  Live Science