Here’s the full article, but the following excerpts are quite informative.
Forest foods are nutritionally important and are traditionally used as supplements to the staple diet. Leafy vegetables and wild animals add diversity, flavour, vitamins and minerals to characteristically grain-dominated diets.
Forest foods are often collected and stored for later use. Forest foods can thus raise rural peoples’ nutritional intake by providing a year-round supply of food.
Trees are also important in emergencies such as drought and famine. They provide food when crops fail.
The role forests play in providing and maintaining suitable conditions for wildlife should not be under-estimated.
As well as making a direct contribution to health by improving nutrition, tree products provide the only medicines available to many people in developing countries. Some plants contain high concentrations of chemicals used as the base for modern drugs.
Many plants are used traditionally for these medicinal qualities, and others undoubtedly depend on effects not yet exploited in Western medicine. These medicines are important nutritionally. By keeping the body healthy, they not only help it to absorb food efficiently but also increase its ability to fight off infections that might otherwise impair digestion and the ability to eat.
In summary the article is rich in data about the benefits of various types of forest food, and yet there is an underlying assumption that people are still dependent on agriculture and that forest food is mostly a supplement, or a fall back emergency food supply “during drought, famine and war”.
I would suggest that perhaps the emergencies are coming more frequently and that consciously designed food forests might become the primary sources of food, as they are far more resilient in a more populated and climate-changed world.
FAO (Food and Agriculture Organisation) http://www.fao.org/docrep/006/u5620e/u5620e03.htm