Has anyone got any good food ideas for providing the main carb element to a meal ...
Begs the question, doesn't it?
Why should a meal need a "main carb element"?
Here's the (short) answer as to why people
think it does.
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(1) Until about 1970 everyone was well-aware that although carbohydrate-rich foods make you put on weight (probably because they spike insulin) they ate plenty of them, principally because they were a large part of the diet in industrialized countries for historical reasons -- for which, read mainly because they're cheap. Bad for health: but cheap:
http://www.direct-ms.org/pdf/EvolutionPaleolithic/Cereal Sword.pdf
(2) A damn fool (Ancel Keys) decided that because arterial plaque contains fat, it "must have" got there from dietary fat. A kindergarten assumption: the body if far more complex than that. Keys "proved" this with a "7 Countries" study ... that, incidentally, threw away data from a number of countries besides the 7 that didn't fit his hypothesis. Up to date scientific research conclusively disproves that:
http://www.ncbi.nlm.nih.gov/pubmed/20071648
(2 a) An aside for the patriotic: Keys was an American and spent an inordinate amount of time badmouthing a Briton, John Yudkin, who had the highly plausible (and probably true) counter-hypothesis that the culprit in heart disease was refined carbohydrate, and principally sugar.
http://www.amazon.co.uk/Pure-White-Deadly-diabetes-completely/dp/0670808199/
(3) People, aware that carbs were fattening (see (1)) but afraid for their hearts (see (2)), began to cast around for an alternative way to lose weight. They decided that low-calorie diets were the answer. Experience actually shows that was a bad idea: it's WHAT you eat that matters:
http://www.amazon.co.uk/Why-We-Get-Fat-about/dp/0307949435/
(4) The U.S.D.A (United States Department of Agriculture) hung its hat on Keys' Diet-Heart Hypothesis and told Americans to stuff themselves with carbohydrate. Hence the epidemic of obesity over there. The U.S.D.A now won't retract --
in the teeth of the evidence --
http://www.nutritionjrnl.com/article/S0899-9007(10)00289-3/fulltext
-- it's not about to, because ... well, when you think it about U.S. agriculture revolves around the production of huge quantities of grain. And, after all, the U.S.D.A. is responsible for agriculture not health. The U.S. Government subsidises grain-production.
(5) Governments all round the world have taken their cue from what the U.S. recommends.
(6) Your grilfried is made ill, because her eating habits are based on what is best for U.S. agriculture.
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Hmmmm ... just hmmm ... What can you say?
The BBC, a pretty stupid and broekn organ itself has finally lumbered awake and made a series that covers some of this:
http://www.bbc.co.uk/iplayer/episode/b01jxzv8/sign/The_Men_Who_Made_Us_Fat_Episode_1/
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To address the question directly:
Potatoes are heavy to carry -- because of the water content. Rice is fairly kind to most people's stomachs. But, really you don't need either. Proprietary gluten-free foods are horrifically expensive, and while they may cause fewer auto-immune reactions for many people, often spike insulin WORSE than wheat bread would. Much more on this here from a cardiologist who gets all his patients off wheat ... and then off replacement gluten-free junk foods, too:
http://www.wheatbellyblog.com/
What to carry? Make some pemmican. It's a travel food that's sustained native peoples across millenia, as the brilliant explorer and anthropologist Vilhjalmur Stefansson explains here:
http://owndoc.com/pdf/The-fat-of-the-land.pdf