Does diet play a part in anti-aging?

Every time I see an article about anti-aging or youthful appearance, I see a whole lot of ideas on what you can do to help yourself look younger. But, I see very few articles stating that, if you take care of yourself, you may not need anti-aging options for years.
Diet, in my opinion, is the most important ingredient in keeping you youthful than any other thing you can do. As long as you eat foods that are low on the Glycemic Index, you will have many youthful years without having to worry about surgery, Botox or anti-aging creams such as timeless secret.
The Glycemic Index measures foods on a scale from 1 to 100. Foods high on the GI cause your blood sugar to spike rapidly then suddenly drop a while later. This fluctuation is very hard on the body, causing stress, which causes premature aging. Foods low on the GI don't stress the body nearly as much, allowing you to retain your youthful glow.
Diet plays a huge part in the aging process. A person who eats foods low on the Glycemic Index will tend to stay looking younger longer without the use of anti-aging methods such as timeless secret.