Glycemic index (also glycaemic index, GI) is a ranking system for carbohydrates based on their effect on blood glucose levels. It compares available carbohydrates gram for gram in individual foods, providing a numerical, evidence-based index of postprandial (post-meal) glycemia.In effect the GI celebrates the core dietary habits of homo sapiens (that's us) for the massive bulk of our evolutionary history.If humans gained so much culturally and in way of productive capacity with the switch to grains based diets the later processing of those grains was part of a dynamic that engineered our eating habits out of sync with our evolutionary capacity to make the most of the nutritional options. We are physiologically still hunter gatherers .
The carbon emitted planet
The analogous tragedy is that our present nutritional habits especially in regard to broad acre farming and food processing and transport -- is a significant factor generating the carbon conundrum we are faced with at the present time.
We need to foster sustainability but we also need to encourage a diet that is not only sustainable in an ecological sense but better for us especially in regard to key questions such as obesity, heart disease and Type II Diabetes. So it has to cut both ways -- be good for the environment and good for us.
Our current diet is neither.
Theres' an easy penchant among some who suggest that vegetarianism is the way to go but thats' not true at all as vegetables per see won't offer a complete agricultural ecology. We need to run cattle , sheep and whatever to make a sustainable system -=- such as Permaculture -- work -- and if we don't eat these critters they get driven in effect from the landscape.
It's a question often of where we gonna get the poo from --and for the moment we don't eat earth worms. So any environmental shift has to be in sync with a dietary one. There has to be a logic and a dynamic involved rather than a crude sentencing proscribing how we'll need to eat and what we can put in our mouths.
So I'm staying the nutritional science offered by the Glycemic Index has a lot to offer the capacity of Permaculture to deliver such a mixed larder of food.
I don't know if anyone has actually written the Permaculture Cookbook -- but I can see the relevance of the two systems in way of menu planning.Permaculture rather than being a sort of farming system is a gathering system. While that distinction is labeling, if you study the way the approach you'll pick up on the marker.
Grain based agriculture historically has been based on core carbohydrate production -- civilisations have been built on one food item alone: wheat (Mesopotania), rice (Ancinet China), corn (Inca) rather than mixed agriculture. Even so called mixed farming practices historically have relied on a limited number of plant and animal sources.
Permaculture is very mixed and pragmatic as it draws from the total of what's on offer in way of plant stock and animal species, and employs its selection on the criteria of whether it fits in ecologically. This approach transcends what may be the limited local indigenous evolution of plants and animals in their applicability to human nutrition or the constraints imposed by the habits of broad acre farming practices.
I guess my point is this:
- If you know what you want to -- or need -- to eat.
- If you know what sort of practices you want to -- or need -- to put in place to achieve sustainability