As we all know that 1/3^rd of food produced for human consumption , about 1.3 billion tonnes per year , is wasted globally . I would like you to go through the below link to know the hard , bitter facts behind food wastage:

http://www.tristramstuart.co.uk/FoodWasteFacts.html

This is sheer wastage of resources  including water, land, energy, labour and capital . The impact of food waste is not only financial but social and environmental  as well. Environmentally, food waste leads to wasteful use of chemicals such as fertilizers and pesticides more fuel used for transportation and more rotting food, creating more methane – one of the most harmful greenhouse gases that contributes to global warming and climate change.

The causes of wasted food are varied , and occur at the stages of production, processing, retailing and consumption. Like other waste, food waste can be dumped, but it can also be fed to animals, or it can be biodegraded by composting or anaerobic digestion, and reused to enrich soil. Dumping food waste in a landfill causes odour as it decomposes.  Food waste can be composted at home.

But to be honest , most of the food waste /solid food waste comes from institutions like hotels , restaurants.  If these institutions handle the issue of food wastage effectively , we can confidently say that a big portion of wastage would be reduced.