1. High cholesterol levels
Many people believe high levels of cholesterol are connected with what you eat. If you want to live a long and happy life, you need to eat vegetables and fruit and get plenty of exercise — or so goes the common belief.
But sometimes high cholesterol levels actually depend not on our lifestyle but on our genes. About 1 in every 500 people has a special genetic mutation which leads to an accumulation of cholesterol in their blood. These people will have high levels of this substance even if they eat nothing but vegetables.