The diversity of food plants for the Lua ethnic group at Toey Klang Village in Doi Phu Kha National Reserve in Nan Province is derived from the forest and farming in kitchen gardens and shifting cultivation. The diversity is the result of physical, biological, socio-economic and cultural factors. It affects their livelihood, consumption and conservation of the forest in order to nurture the plants. For the ethnic group, shifting cultivation is like their food bank while plants for consumption are mostly from the forest. Nowadays, the group is still practiced shifting agriculture with a cycle of about 8-10 years. However, the cycle may be reduced to two to three years in the future due to a lack of land and due to population growth. Shifting cultivation starts by clearing land for agriculture and then letting it rehabilitate itself before returning to the same place when the cycle is repeated. The practice is a natural rehabilitation and a respect to nature. It is also a subsistent type of agriculture allowing for a simple and content lifestyle. Such a lifestyle is not destructive to natural resources (pp. 53-54).