Caffeine aside, coffee can be considered a healthy drink, judging by the preponderance of research suggesting it may protect against a variety of diseases and help us live longer. Keep in mind that these studies found an association between better health and coffee drinking, but researchers haven't yet found exactly what causes these benefits. It could be, for example, that coffee drinkers are more active and social. Or it could be that one of the more than 1,000 compounds that coffee naturally contains boosts our health. We don't know.
Blood and insulin benefits - Many foods that have in them glucose are sweet, but our bodies (and especially liver) have larger problem disassembling glucose than fructose that can be found in sugar. Because of this, insulin levels will be greatly increased during the short periods of time, making you feel energetic and powerful. Sadly after that initial rush, drop of insulin will also make you hungry for more sweets. But that is not all. Because of the influence of sugar’s glucose has on the hormone leptin, you will indeed feel more full than after eating foods with fructose.
As with any activity thought to improve health, researchers are trying to identify the specific characteristics of volunteering that provide the greatest benefit. For example, how much time would you need to put into volunteer work to lower your blood pressure or live longer? In the Carnegie Mellon study, 200 hours of volunteering per year correlated to lower blood pressure. Other studies have found a health benefit from as little as 100 hours of volunteering a year. Which types of volunteer activities improve health the most? No one really knows. Sneed speculates that mentally stimulating activities, like tutoring or reading, might be helpful for maintaining memory and thinking skills, while “activities that promote physical activity would be helpful with respect to cardiovascular health, but no studies have really explored this.”