Here some suggestions of the WWF:
– buy local products
– eat seasonal products
– decrease meat consumption
– buy only sustainably-fished seafood
– reduce food waste in general
– promote organic (bio) products
– do not buy products with too many packaging
– try to avoid processed foods
– drink tap water
– avoids food waste in the kitchen
For more, please visit their sites (DE, FR, IT) at:
https://www.wwf.ch/it/i-nostri-obiettivi/frutta-e-verdura or
http://www.oneplanetfood.info or
http://www.oneplanetfood.info/alimentazione-sostenibile/10-consigli/