heart attacks and what are the main causes

The main risk factors are smoking, obesity and unmanaged stress.

Mcdondals big mac //

clogging of an artery

You should read this page and click the links through to the specifics, it makes for interesting reading but do not let it put fear into you!
http://medicinenet.com/heart_attack/article.htm

l had a heart attack as a result of Anaphylaxis, brought on by a sudden and unknown allergy to citrus, there was too much strain l guess but it is a little known cause.

In short; the most common underlying disease for heart attacks is atherosclerosis, where fatty plaques build up on the lining of the coronary arteries (known as coronary artery disease) this is a gradual process that slowly limits the blood supply to the heart muscle.
The biggest single risk factor for an M l is smoking.
Ways to reduce ur risk & also prevent high BP;
If u smoke, STOP
Be as close to ur ideal weight as possible
Reduce salt intake in ur diet
Exercise
Healthy diet.

To a certain extent atherosclerosis is also part of the ageing process too. But the above or lack or will accelerate it.

subway, mc donalds, buger king, yummy kfc chicken, etc.. their fat blocks our poor arteries making life harder for our litle hearts

High Blood pressure
High cholesterol
Narrowed or blocked coronary arteries

All of which are treatable

could be due to clots, deep vein thrombosis, high blood pressure, high cholesterol, lack of exercise and overweight