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Ask a doctor or elders about the food Items which contain Iron.

Answer
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Hint: There are various foods that are rich in iron. Green leafy vegetables originating from Persia, aquatic invertebrates, and various dry grains are the foods that are rich in iron content.

Complete answer:
Iron is a mineral that has many important purposes, the primary one being to hold oxygen as part of the red blood cells in the body. It's an important nutrient that we have to get from food. The daily value (DV) of iron is 18 mg.
Iron deficiency can occur when the intake is too low. Iron deficiency can lead to anemia and symptoms such as fatigue. Menstruating women who do not eat iron-rich foods is at an extremely high risk of deficiency. Fortunately, there are many healthy food options available to help us in meeting our daily iron needs.
Shellfish: Shellfish is tasty and nutritious. All shellfish are high in iron, but clams, oysters, and mussels are particularly good sources. For instance, a 3.5-ounce (100-gram) serving of clams may contain up to 3 mg of iron, which is 17 percent of the DV. However, the iron content of clams is highly variable, and some types may contain much lower amounts. The iron in shellfish is heme iron, which our body absorbs more easily than non-heme iron.
Spinach: Spinach offers a lot of health benefits and has very few calories. Approximately 3.5 ounces (100 grams) of raw spinach contains 2.7 mg iron or 15 percent DV. Even though this is non-heme iron which is not very well absorbed, spinach is also rich in vitamin C. This is essential because vitamin C greatly enhances the absorption of iron.
Legumes: Some of the most common legume types include beans, lentils, chickpeas, peas, and soybeans. They are a great iron source, especially for vegetarians. One cup of cooked lentils (198 grams) contains 6.6 mg, which is 37 percent of the DV. Beans such as black beans, navy beans, and kidney beans will all help pump up your iron intake quickly. A half-cup (86-gram) serving of cooked black beans actually provides around 1.8 grams of iron or 10 percent of the DV.
Tofu: Tofu is soya which is popular among vegetarians and in some Asian countries. A half-cup serving (126-gram) contains 3.4 mg of iron, which is 19 percent of the DV. Tofu also provides a strong source of thiamine and other minerals including calcium, magnesium, and selenium. It offers 22 grams of protein per serving.
Red meat, quinoa, broccoli, dark chocolates, and fish are some of the other iron-rich foods.

Note: Excess iron in vital organs raises the risk of liver disease (cirrhosis, cancer), heart attack, diabetes mellitus, osteoarthritis, osteoporosis, metabolic syndrome, hypothyroidism, hypogonadism, multiple symptoms, and, in some cases, premature death, even in mild cases of iron toxicity. Iron is poisonous, at high doses. The upper limit — the maximum dose that can be safely taken — is 45 mg per day for adults and children aged 14 and up. Children under age 14 should not take more than 40 mg a day.