What is the nutrient possibly making your heart younger? (2/2)

What is the nutrient which will be the key to make your heart younger?

That is IRON.

​Iron becomes red when combined to oxygen. Our body contains 3 to 5 g of iron. Hemoglobin containing iron carries oxygen to the whole body. Previously, the most important role of iron was considered as carrying oxygen to the whole body. However, it has turned out that iron is playing an important role for the heart. Our muscle doesn’t move without iron. The heart is a mass of muscles so it doesn’t move well if iron is insufficient. There is a possibility that the increase of heart failure is related to lack of iron.
 
What do you need to eat to take iron efficiently?
Iron is contained a lot in liver, red meat and animal heart.
Decrease of eating meat with age is considered as a cause of insufficient iron.
 
68 years old female whose iron is 34.8 ng/ml (baseline 100 ng/ml) is possibly in pre-heart failure condition. Her family runs a bakery. She starts working at 6 am and the morning is the busiest time because they have to prepare 300 breads. She has breakfast at 8 am. She eats the leftover breads of yesterday, some broccolis and lotus roots. Lunch time is busy with customers so she has her lunch at 3 pm. She eats some ham & egg sandwiches, a cup of soy source soup with vegetables and fish dumplings, some vegetables boiled down in soy source, and an orange. Her work is over at 6:45 pm. She eats brown rice, grilled salmon, salad, boiled vegetables and a persimmon.

The amount of iron she takes from her meals is 6.1 mg which is lower than the average of 60s female in Japan, 8.1 mg. How much iron does she have to take in order to make her heart younger? She starts to take more than 10 mg of iron a day for 10 days.
 
She prepares a dish made of dried daikon radish, soy bean products (fried bean curd) and Enoki mushroom, which she can store for a few days, and also she can take more than 10 g of iron a day if she eats 3 times. To accomplish it, she cooks and eats various kinds of dishes mixing the prepared dish. 10 days later her iron increased from 32.4 to 69.2 ng/ml. She also tried 6 minutes walking test. Last time she walked 580 m but couldn’t accomplish the baseline 586.9 m. This time she walked 608 m which is 28 m more than the last time.