I have diabetes, am I at greater risk to experience Jet lag?

From Wikipedia: "Dietary causes account for about 12% of gout, and include a strong association with the consumption of alcohol, fructose-sweetened drinks, meat, and seafood. Other triggers include physical trauma and surgery. Studies in the early 2000s have found that other dietary factors once believed associated are, in fact, not, including the intake of purine-rich vegetables (e.g., beans, peas, lentils, and spinach) and total protein. With respect to risks related to alcohol, beer and spirits appear to have a greater risk than wine. The consumption of coffee, vitamin C and dairy products, as well as physical fitness, appear to decrease the risk. This is believed partly due to their effect in reducing insulin resistance."

Jet lag occurs when you travel across several time zones. When you do so, your body goes out of sync with the destination time and it experiences daylight and darkness contrary to the rhythms it has grown accustomed to.

Absolutely, afternoon sun can greatly benefit you if you are Jet lagged. Moreover, short naps and showers can also help you with treating and dealing with Jet lag.

For treating jet lag, it is suggested that a dose between 0.3 mg and 5 mg of melatonin be taken on the first day you travel at the time you will want to go to sleep at your destination. This may be continued at bedtime for a few days once you are at your destination.

Yes, people flying across few time zones may be able to adjust without noticeable effects of the time change. Those flying across many time zones will likely develop noticeable symptoms of jet lag.

Absolutely, when you're flying north or south in the same time zone you experience the fewest problems because the time of day always remains the same as in the place where the flight originated. On the other hand, when you're flying east, you typically experience the most problems because you "lose" time. When you're flying west you "gain" time and usually have an easier time adjusting.