Fast-5 Diet and Lifestyle: Re: [fast5] Interesting news item on tea and coffee

Tuesday, December 15, 2009

Re: [fast5] Interesting news item on tea and coffee

Tea and coffee both interfere with iron absorption too. High levels of
ferritin are very much associated with T2 diabetes, and giving blood
has shown to be protective for T2. Given the high levels of
iron-supplementation of our food, we NEED to drink tea or coffee with
them!

http://www.clinchem.org/cgi/content/full/51/7/1201

Frequent blood donors (2–10 donations) had increased insulin
sensitivity [3.42 (1.03) vs 2.45 (1.2) x 10–4 · min–1 · mIU/L; P =
0.04], decreased insulin secretion [186 (82) vs 401.7 (254) mIU/L ·
min; P <0.0001], and significantly lower iron stores [serum ferritin,
101.5 (74) vs 162 (100) µg/L; P = 0.017] than nondonors, but the 2
groups had similar blood hematocrits and blood hemoglobin
concentrations.

http://www.feinberg.northwestern.edu/nutrition/factsheets/iron.html

Tannic acid in coffee and tea also adversely affects iron absorption.
Consumption of coffee or tea one hour before or after consumption of a
nonheme iron dietary source can reduce absorption of this mineral by
as much as 40%.

Incidentally, the foods with the highest iron-supplementation are the
*carb* foods, which I think is a confounding factor for diabetics. One
serving of Chex cereal, for instance, has a whole day's worth of iron
in one serving. Most "white flour" is "enriched", and even the rice,
so even homemade food is loaded with iron.

On Tue, Dec 15, 2009 at 6:25 AM, dnn8350 <david@davidnyman.com> wrote:
> Some new data on the apparently beneficial influence of tea and coffee on type 2 diabetes:
>
> http://news.bbc.co.uk/1/hi/health/8411605.stm
>
> I wonder how to take this, given the popularity of tea-drinking in the UK, and coffee-drinking in the US. It seems to imply that type 2 diabetes would be even commoner in the population if less of these beverages were drunk.
>
> David
>
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