Yikes! I'll need to keep my eye on this. If these results are replicated ... it's a rather big deal. And, for us coffee lovers ... it's a very sad day?
I'll research this some more and report back ... sometime soon.
In the meantime, ladies can hope this is a phenomenon relating only to men.
In a study involving 10 healthy men, consumption of caffeinated (5 mg/kg) coffee was found to impair acute blood glucose management and insulin sensitivity.
Subjects consumed either caffeinated (5 mg/kg body weight) coffee or decaffeinated coffee, followed by a 75 gram oral glucose load (either a high glycemic index (GI) cereal or a low GI cereal mixed meal tolerance test), one hour later.
Results found that compared to consuming decaffeinated coffee prior to the high GI meal, when subjects consumed caffeinated coffee followed by the high GI meal, areas under the curve were higher for glucose (147%), insulin (29%), and C-peptide (40%).
After consumption of the low GI meal, areas under the curve were also greater for glucose (216%), insulin (44%), and C-peptide (36%), when caffeinated coffee had been consumed. Moreover, insulin sensitivity was significantly reduced (by 40%) when the high GI meal was consumed following caffeinated coffee, and it was reduced by 29% after consumption of the low GI meal.
The authors conclude, "Future investigations are warranted to determine whether caffeinated coffee is a risk factor for insulin resistance."
Six out of nine prospective cohort studies have found higher coffee intakes to be associated with significant reductions in the risk of type 2 diabetes mellitus (DM) (10-14).
The two largest prospective cohort studies to examine the relationship between coffee consumption and type 2 DM were the Health Professionals Follow-up Study (41,934 men) and the Nurses’ Health Study (84,276 women) in the US.
Men who drank at least 6 cups of coffee daily had a risk of developing type 2 DM that was 54% lower than men who did not drink coffee, and women who drank at least 6 cups of coffee daily had a risk of type 2 DM that was 29% lower than women who did not drink coffee (12). In both cohorts, higher caffeine intakes were also associated with significant reductions in the risk of type 2 DM.
Decaffeinated coffee consumption was associated with a more modest decrease in the risk of type 2 DM, suggesting that compounds other than caffeine may contribute to the reduction in risk.
Recently, a systematic review of nine prospective cohort studies, including more than 193,000 men and women, found that the risk of type 2 DM was 35% lower in those who consumed at least 6 cups/d of coffee and 28% lower in those who consumed between 4-6 cups/d compared those who consumed less than 2 cups/d (15).
The mechanism explaining the significant reductions in the risk for type 2 DM observed in the majority of prospective studies is unclear, since short-term clinical trials have found that caffeine administration impairs glucose tolerance and decreases insulin sensitivity (16, 17). Until the relationship between long-term coffee consumption and type 2 DM risk is better understood, it is premature to recommend coffee consumption as a means of preventing type 2 DM (12,15).
Strange findings indeed. Coffee impairs Glucose, but may reduce Diabetes.
Personally I don't drink Coffee, never have, the smell makes me gag sometimes. Plus I could do without the possible Heart stimulus and Vasoconstriction. Don't see the need to possibly complicate matters.
I think but I'm not 100% sure, Caffeine and Tannic Acid don't benefit Iron absorption either.
Another thing to consider, if you decide to have coffee:
BACKGROUND: Coffee consumption has been associated with several risk factors for coronary heart disease, including increased cholesterol, increased blood pressure, and increased plasma total homocysteine (tHcy). tHcy is determined by several B-vitamins. However, reports about the association between coffee intake and B-vitamin status are few.
METHODS: We measured plasma B-vitamins and tHcy in a cohort of 10 601 healthy, middle-aged Norwegian men and women. Information about lifestyle factors, including coffee consumption, smoking, alcohol use, height, and weight, was obtained by interview.
RESULTS: Coffee consumption was dose-dependently associated with reduced plasma B-vitamin concentrations. Compared with coffee abstainers, individuals drinking >/=4 cups/day had 11.7% (P < 0.001), 14.1% (P < 0.001), and 5.5% (P = 0.01) lower plasma concentrations of folate, pyridoxal phosphate, and riboflavin, respectively, and the mean tHcy concentration was 6.8% (P < 0.001) higher.
Quantile regression analysis showed essentially no difference in B-vitamin concentrations between coffee consumption categories at low vitamin concentrations but a progressive increase in the difference at higher concentrations. This pattern of differences (effect profile) was found independently of smoking status, alcohol intake, and sex. The decrease in folate explained approximately half of the increase in tHcy.
CONCLUSIONS: Coffee consumption was associated with reduced circulating B-vitamin concentrations. The observed effect profiles indicated that coffee consumption preferentially affected the upper, but not the lower, part of the B-vitamin concentration distributions. We hypothesize that coffee consumption may increase the loss of surplus B-vitamins by excretion in urine.
Coffee is detrimental to most as is alcohol. It is so powerful that it can interfere with a reduced carbohydrate dietary regimen. Caffeine always causes an insulin response as does adrenalin (anger, excitement, stress). Adrenalin is also the opponent to insulin and the combination of adrenalin and coffee is very toxic.
Since diabetes type II is a disease cause by prolonged state of metabolic acidosis. First year medical study tells us that when a body goes into metabolic acidosis "hormones will no longer function" as in insuline..!!
Coffee has a strong dehydration effect - which in his turn will increase the acidity level .....
This is one of the reason why in strong coffee consuming tradition you always receive a glass of mineral water.....(france)
I noticed that all people with diabetes type II who came to my center for help had a dehydration level of min 20% up to 30%. The total body water in these people was between 36% and 45 % - we all know that a healthy body needs to be around 65% water.!!!
The pH value of the interstitial fluids was 7.19 where 7.26 is the minimum and 7.36 the max value.....( severe metabolic acidosis)
After drinking a lot of ionized alkaline water and rehydrating their body they are ALL diabetes free...with normal sugar levels - No diet required.