Is a 22 year old man able to have heart arrhythmia?

Yes. Congenital heart conditions, drugs, medications and electrolyte imbalances can all cause arrhythmias.

Yea, and this is usually caused by a magnesium deficiency. It's known to be required for several hundred different functions in the body. So you may want to eat green vegetables such as spinach are good sources of magnesium because the center of the chlorophyll molecule (which gives green vegetables their color) contains magnesium. Some legumes (beans and peas), nuts and seeds, and whole, unrefined grains are also good sources of magnesium. Refined grains are generally low in magnesium. When white flour is refined and processed, the magnesium-rich germ and bran are removed.

Bread made from whole grain wheat flour provides more magnesium than bread made from white refined flour. Tap water can be a source of magnesium, but the amount varies according to the water supply. Water that naturally contains more minerals is described as "hard". "Hard" water contains more magnesium than "soft" water. Or you can take a quality multi-mineral supplement. Hope this helps.

Yes

I was going to answer your question, then I read the other answers. To make life easy, N said exactly what I was going to say. She is correct!