We’ve discussed in the past many ways we can improve our hair’s health, one of them being nutrition. However, there are many types of foods that can adversely impact your hair growth as well. Hair is made from a protein called keratin this same protein is also the same proteins that make your nails. For that reason, a diet that positively impacts your nails, can also positively impact your hair.


Having too much of anything can be bad. When it comes to nutrients, balance is key. This is why you can’t improve your health by taking a bunch of vitamins at the same time. For water-soluble vitamins, your body will only take what it needs and expel the rest through your waste. Fat-soluble vitamins, on the other hand, are not expelled as easily as such, you can run the risk of toxicity if you have too much in your body.

Too much vitamin A

Vitamin A is an important element in keeping your hair healthy, it can strengthen your hair and reduce hair breakage, however too much can lead to toxicity in the body; this condition is known as hypervitaminosis A. There are two distinct types chronic and acute. Acute is what occurs when a person takes too much Vitamin A in a short period of time, while chronic toxicity is what occurs when a person takes large amounts of the vitamin, and it builds up in the body over a long period of time. Vitamin A is a fat-soluble vitamin that is stored in the liver. The amount of vitamins you need is determined in large part by your age, weight, and condition (such as if you are pregnant, breastfeeding, etc.). Symptoms of hypervitaminosis A will change depending on whether it is acute toxicity or chronic. Acute toxicity will have such symptoms as drowsiness, abdominal pain, nausea, and vomiting. Chronic Vitamin A toxicity can result in hair loss, dizziness, blurry vision, and nausea and vomiting.


While many of us would never intentionally poison ourselves with mercury, it can happen unintentionally. Fish can provide a lot of benefits to your health; however, consuming too much fish that is high in mercury can cause hair loss. A few of the symptoms associated with mercury poisoning are headaches, muscle atrophy, twitching of the muscles, and decreases in mental functioning. Heavy exposure to mercury can also lead to kidney malfunction and respiratory issues.

Deficiencies in your diet

Deficiencies or too little of something can be detrimental for your hair health because your body won’t have the necessary nutrients to maintain optimal health. For example, iron is important because it helps blood flow. Too little iron can cause hair loss because your hair follicles are not able to receive the nutrients they need to produce healthy hair. A balanced diet can go a long way in helping you maintain optional health. A balanced diet should be able to provide your hair and body with everything it needs to grow healthy, however, that’s not always easy to get all the vitamins and nutrients you need from diet alone. That’s why there are vitamins and dietary supplements that can be taken to give your body what it needs to stay healthy.

To learn more about some of the key nutrients, your body needs to grow healthy hair check out our previous blog What’s in your Vitamin.

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