Quantrill said Kiwis' affinity for coffee over tea gave them that extra kick to get their day going, however, people need to be careful not to have too much.
"There's a lot more caffeine in coffee than tea and it's this element that gives our brains the shove we sometimes need in the morning.
"The flip side, as many of us know, is we've got to be careful with our afternoon double shots or after dinner coffee as it can give an energy boost that stops us getting a restful sleep."
Caffeine is a central nervous system stimulant which is found in tea, cocoa, energy drinks and many soft drinks. It increases energy alertness, motivation and concentration, but can induce dizziness, increased heart rates, irritability, anxiety, tremors and insomnia.
The New Zealand Food Safety Authority estimates over 73 per cent of New Zealanders are exposed to caffeine in their diet.
"For those of us who like to make ourselves coffee first thing in the morning, we often have a larger than average cup or give ourselves a refill, which is obviously far more than what you expect in an average cup."
Quantrill said people should take into consideration what coffee they drink, as instant coffee can have 50 per cent less caffeine than filtered coffee. Lightly roasted coffee beans are also believed to have high levels of caffeine when compared to darker varieties.