Some foods are beneficial to human health, but misuse of them can be harmful.
Carrot: If a smoker ingests a large amount of β-carotene in carrot, the eyes and palms may change yellow and, in severe case, it will increase the risk of developing lung cancer. So it should not be overfed.
Mackerel, anchovy: Blue-back fish contains a large amount of protein metabolites called purines, so excessive intake by gout patient can lead to higher uric acid levels and worsen the disease.
Garlic, ginkgo nut: Both are healthy foods, but people with bleeding diseases should be careful because they have the risk of bleeding.
Nuts: nuts such as peanuts, pine-nuts, etc. have anti-aging and anti-cancer effects, but migraine patients should be careful. This is because the ingredients in the nuts cause headaches.