Effects of alcohol ingestion on estrogens in postmenopausal women.
OBJECTIVE
To determine if moderate alcohol drinking increases circulating estradiol levels in postmenopausal women who are taking estrogen replacement.


METHODS
Randomized, double-blind, placebo-controlled crossover study of the effects of alcohol ingestion on plasma estradiol and estrone.


METHODS
Inpatient Clinical Research Center.


METHODS
Twelve healthy postmenopausal women receiving oral estrogen (estradiol, 1 mg/day) and progestin (medroxyprogesterone acetate) replacement therapy were compared with 12 postmenopausal women who were not using estrogen replacement therapy (ERT).


METHODS
Each group drank alcohol (0.7 g/kg) and an isoenergetic (isocaloric) placebo (randomized sequence) on consecutive days. Women who were taking ERT were studied during the estrogen-only portion of their replacement cycle, and estrogen was administered each evening at 2100 hours.


METHODS
The impact of alcohol ingestion on plasma estradiol and estrone levels.


RESULTS
Alcohol ingestion lead to a 3-fold increase in circulating estradiol in women on ERT; however, alcohol did not change estradiol significantly in control women who were not on ERT. In women using ERT, estradiol levels increased from 297 to 973 pmol/L (81 to 265 pg/mL) within 50 minutes (P<.001) during the ascending limb of the blood alcohol curve and remained significantly above baseline for 5 hours (P<.001). No significant increase in circulating estrone was detected in either group. However, estrone levels decreased after alcohol and placebo in women on ERT (P<.05). Blood alcohol levels did not differ significantly in women who used ERT and those who did not. Peak blood alcohol levels of 21 mmol/L were attained in each of the 2 groups within 50 to 60 minutes after drinking began. Changes in estradiol were significantly correlated with changes in blood alcohol levels on both the ascending (P<.001) and descending (P<.001) limb of the blood alcohol curve.


CONCLUSIONS
Acute alcohol ingestion may lead to significant and sustained elevations in circulating estradiol to levels 300% higher than those targeted in clinical use of ERT. Potential health risks and benefits of the interactions between acute alcohol ingestion and ERT should be further evaluated.
Ginsburg
E S
ES
Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, MA 02115, USA.
Mello
N K
NK
Mendelson
J H
JH
Barbieri
R L
RL
Teoh
S K
SK
Rothman
M
M
Gao
X
X
Sholar
J W
JW
D000428:Alcohol Drinking / Q000097:blood / Q000503:physiopathology*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004958:Estradiol / Q000097:blood* / Q000627:therapeutic use; D015914:Estrogen Replacement Therapy; D004970:Estrone / Q000097:blood*; D000431:Ethanol / Q000494:pharmacology*; D005260:Female; D006801:Humans; D017258:Medroxyprogesterone Acetate / Q000627:therapeutic use; D008875:Middle Aged; D017698:Postmenopause / Q000502:physiology
D004970:Estrone; D000431:Ethanol; D004958:Estradiol; D017258:Medroxyprogesterone Acetate