"The United Nations reports food lost or wasted globally to be around 1.3 billion tonnes of food per annum, which includes four million tonnes wasted in Australia," he said.
"At the same time, two billion people presently suffer hunger and malnutrition worldwide and 25,000 die every day from hunger or hunger-related causes.
"Clearly wasting food is indefensible from an environmental, economic and moral point of view."
Dr Sharma said while the major cause of food loss in developing countries was from pests, developed nations were squandering enough food to feed millions through neglect.
"People are disconnected with the production of food," he said. "They have forgotten or have never known how we get the food they consume.
"We fail to appreciate that to produce a kilo of potatoes requires about 500 litres of water and a kilo of rice 2000 litres. That cup of coffee left undrunk has taken 140 litres of water. And then to this you add the physical labour, cost of transportation, fertilisers, environmental impacts, etc."
With the world population set to increase by two billion people in the next 40 years, protection of food had become as important as production, according to Dr Sharma.
"We currently lose enough food along the food supply chain to feed two billion people, partly due to pests, but in large part due to waste," he said.
"A surprising amount can be done by being aware and modifying our habits."
Dr Sharma also encouraged people to be vocal in ensuring Australia's biosecurity. He said currently over 70,000 species of pest were active in the world damaging agricultural crops and that exotic species caused $1.4 trillion in losses every year.
