Avoid grapefruit juice if you are on spiro - I saw an article telling why this is bad just yesterday.
Edit - I just found the text (yes, it does have a lot of info regarding MtF trans people, but the main point is spiro + grapefruit = bad).
Grapefruit juice increases estrogen by slowing down its metabolic breakdown. Some doctors will advise people on estrogen therapy to avoid eating grapefruits or drinking grapefruit juice. This is a good idea. Curiously, however, avoiding grapefruit for MTF TSs is important not so much in managing estrogen but in lowering water retention that might be induced from spironolactone (which normally lowers water retention).
Consider (1). It mentions that the glycyrrhetic acid in licorice inhibits 11 beta-hydroxysteroid dehydrogenase in the kidney. This blocks the diuretic effects of spironolactone leading to water retention. Without going into detail this water retention will be much worse in a MTF TS on spironolactone than in someone else not on spironolactone due to non-genomic effects of aldosterone.
(2, 3, 4) show that the grapefruit juice can do the same thing as glycyrrhetic acid. Specifically, (3) mentions the naringenin in grapefruit juice as the substance that blocks spironolactone in the kidney.
(5) shows that increasing 11 beta-hydroxysteroid dehydrogenase in our fat cells increases fat subcutaneously but not in retroperitoneal fat. So the enzyme puts fat just where we need it to feminize ourselves. The deep, dangerous fat in our abdominal cavity (i.e. the retroperitoneal fat) is not affected
and the feminizing subcutaneous fat is increased. Obviously one has to control calorie intake to prevent going overboard on the fat gain even subcutaneously.
My recommendation is MTF TSs taking spironolactone consume no grapefruit juice and be very cautious about eating grapefruit.
Big warning - the effects of grapefruit on the kidney includes a tendency to LOWER potassium. Spironolactone has a tendency to INCREASE potassium. So, if you’ve been consuming a lot of grapefruit juice and your potassium has been just fine the two effects may have balanced out. If you stop consuming grapefruit your potassium is likely to elevate which can kill you. Be sure to have regular blood work to evaluate your potassium level and to eat a low potassium diet if on spironolactone.
Bonus information - if your cortisol has been chronically elevated by grapefruit juice once you lower cortisol by avoiding grapefruit juice you may find a considerable increase in your sex drive. That is if you’re taking progesterone or, I assume, related substances like Provera. (6) indicates that cortisol
blocks progesterone. Lowering cortisol allows progesterone to exert an effect that elevates libido. For most people in a direction heavily in the into men direction.
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http://home.caregroup.org/clinical/altmed/interactions/Drugs/Spironolactone.htm
mechanism: Licorice can offset the pharmacological effect of spironolactone. 11 beta-hydroxysteroid dehydrogenase (11 beta-DH) is the enzyme that oxidizes cortisol to inactive cortisone and prevents cortisol from acting like a mineralocorticoid at the
aldosterone receptor site in the kidney. Some kinds of licorice contain glycyrrhetic acid which inhibits the action of 11 beta-DH (e.g. in the kidney) and causes cortisol to behave like aldosterone. [Nerissa note - it also allows the aldosterone which spironolactone has elevated but blocked to again become active in retaining water.]
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Clin Pharmacol Ther. 1996 Jan;59(1):62-71 Grapefruit juice and its flavonoids inhibit 11 beta-hydroxysteroid dehydrogenase.
INTRODUCTION: The enzyme 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) oxidizes cortisol to inactive cortisone.
PMID: 8549035
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Zhongguo Yao Li Xue Bao. 1997 May;18(3):240-4
Inhibition of 11 beta-hydroxysteroid dehydrogenase obtained from guinea pig kidney by some bioflavonoids and triterpenoids.
AIM: To study the inhibitory effect of some bioflavonoids and triterpenoids on 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) from guinea pig kidney. METHOD: The 11 beta-OHSD of kidney
cortex microsomes in addition of cortisol was incubated in the presence of NADP, Triton DF-18, and the test compounds at 37 degrees C for 1 h. The enzyme activity was assayed by measuring the rate of conversion of cortisol to cortisone eluted with HPLC
gradient analysis. RESULTS: The IC50 (95% confidence limits) values of glycyrrhizic acid, naringenin, fisetin, emodin were 254 (202-320), 336 (270-418), 470 (392-564), and 527 (425-653) mumol.L-1, respectively.
The inhibitory effect of oleanolic acid was 2-fold stronger than that of astramembranin I. The mode of action of naringenin was competitive inhibition.
CONCLUSION: The test compounds inhibited the 11 beta-OHSD in kidney cortex with different potencies as glycyrrhizic acid did.
PMID: 10072942
Glycyrrhizic acid is in licorice, naringenin is in grapefruit and to a lesser extent OJ, fisetin is in strawberries and emodin is in rhubarb.
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Eur J Endocrinol. 2005 Aug;153(2):291-9
Expression of renal 11beta-hydroxysteroid dehydrogenase type 2 is decreased in patients with impaired renal function.
glucocorticoids such as cortisol and may contribute to the increased sodium retention seen in patients with impaired renal function.
PMID: 16061836
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J Steroid Biochem Mol Biol. 2007 Apr;104(1-2):81-4
11-Beta hydroxysteroid dehydrogenase type 2 expression in white adipose tissue is strongly correlated with adiposity.
High-fat fed animals overexpressed 11betaHSD2 in subcutaneous but not in retroperitoneal fat. Interestingly, mRNA levels strongly correlated in both tissues with different parameters related to obesity, such as body weight, adiposity and insulin resistance, suggesting that this gene is a reliable marker of
adiposity in this rat model of obesity. Thus, 11betaHSD2 is expressed in adipose tissue by both adipocytes and stromal-vascular cells, which suggests that this enzyme may play an important role in preventing fat accumulation in adipose tissue.
PMID: 17208436
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http://menopause.zaadz.com/blog/2006/10/low_libido_id_rather_read_a_book
Another major component of healthy libido is stress reduction. Stress causes cortisol levels to rise above normal, and cortisol then can occupy the progesterone receptor, the lock in a cell into which progesterone fits, and block the action of this important hormone. Many women then experience an imbalance between their estrogen and progesterone. Subtle changes in progesterone action can cause low libido. Often a small amount of progesterone can improve desire along with working to minimize the impact of stress.