It is not obvious when examining a wrapped lettuce or a microwavable bowl of Chinese soup. But plastic food packaging is made of multiple layers designed to act as a barrier for oxygen or bacteria .

Increasingly, many of the plastic products we use every day are no longer based on petroleum raw material . Instead, they are made from biomass such as starch, sugar, corn and other sources that also happen to be food products.

One way communication does not work. No better proof is that previous attempts to increase public awareness of healthily eating have failed. Despite numerous campaigns, no significant change occurred in patterns of food purchase and consumption.

Staying healthy requires constantly stimulating the immune system. Ingesting non-digestible fibres such as polysaccharides is thought to help. Yet companies including such ingredients in their food products cannot claim that they boost the immune system.