I love grapes! Whenever I go grocery shopping I get grapes.
.The best eating grape are table grapes, which are large but firm, have thin skins and very often are seedless.
My favorite grapes are white grapes, they seem to taste sweeter and stronger.
White grapes, A.K.A Green Grapes contain a lot of vitamins such as, Vitamin C, Thiamine, Riboflavin, Vitamin B6, Copper, and Manganese. So if you consumer one cup of grape then you would get more than a quarter of the RDI which is a component of Vitamin K, which is a fat- soluble vitamin that helps with blood clotting and healthy bones. 
I do feel refreshed after eating grapes. Whenever I eat fruits I make sure I have enough to be healthy.
Eating a healthy amount of fruits everyday is proven to decrease your risk of many diseases.
I guess as long as I keep buying grapes, the more I will be healthy, and the more I can live to buy more grapes!
Adding blueberries to your grapes would help prolong life by protecting your body against diseases and potentially boost your life longevity. 
I do not like the taste of blueberries, but I will consider adding those to my diet. Health issues do run in my family.
To decrease your chances of health issues that you are at risk for would be to exercise normally and don't smoke. If you are currently smoking, it is highly recommended by health professionals to stop. 
Thank you, I do not smoke!