Various studies have shown that mint significantly decreases testosterone levels along with other adverse effects. Anyway, herbs shouldn't be consumed too frequently or in excess. Of course, occasional mint should be fine but I'm a bit sad because mint recently became my favorite herb.. until I researched it online and came upon these studies  

Spearmint herbal tea has significant anti-androgen effects in polycystic ovarian syndrome. A randomized controlled trial.
http://www.ncbi.nlm.nih.gov/pubmed/19585478

Forty two volunteers were randomized to take spearmint tea twice a day for a 1 month period and compared with a placebo herbal tea. At 0, 15 and 30 days of the study serum androgen hormone levels and gonadotrophins were checked, the degree of hirsutism was clinically rated using the Ferriman-Galwey score and a questionnaire (the modified DQLI = Dermatology Quality of Life Index) was used to assess improvements in the level of self-reported hirsutism. Forty one of 42 patients completed the study. Free and total testosterone levels were significantly reduced over the 30 day period in the spearmint tea group (p < 0.05). LH and FSH also increased (p < 0.05).

The effect of Mentha spicata Labiatae on uterine tissue in rats
http://tih.sagepub.com/content/22/8/343.abstract

Twenty female Wistar albino rats weighing 160±10 g were used for this study. Rats were divided into two groups of ten animals: group I received no herbal tea (control group) and group II received 20 g/L M. spicata tea. Control group rats were given commercial drinking water (Hayat DANONESA water). Herbal tea was prepared daily and provided at all times to the rats over 30 days as drinking water. Plasma malondialdehyde (MDA) levels were determined. In addition, uterine tissues were submitted for histopathologic examination. MDA levels were increased in group II when compared with the control group. The difference between group II and the control group was statistically significant (P < 0.01). In the M. spicata Labiatae-treated group, histopathological changes like apoptosis and diffuse eosinophil leucocyte infiltration in surface and stromal glandular epithelium were observed in both endometrium and endocervix. It was concluded that lipid peroxidation and uterine damage occurs after M. spicata administration in rat uterus.

Effects of peppermint teas on plasma testosterone, follicle-stimulating hormone, and luteinizing hormone levels and testicular tissue in rats
http://www.goldjournal.net/article/S0090-4295%2804%2900418-2/abstract

The experimental study included 48 male Wistar albino rats (body weight 200 to 250 g). The rats were randomized into four groups of 12 rats each. The control group was given commercial drinking water, and the experimental groups were given 20 g/L M. piperita tea, 20 g/L M. spicata tea, or 40 g/L M. spicata tea. The follicle-stimulating hormone and luteinizing hormone levels had increased and total testosterone levels had decreased in the experimental groups compared with the control group; the differences were statistically significant. Also, the Johnsen testicular biopsy scores were significantly different statistically between the experimental groups and the control group. Although the mean seminiferous tubular diameter of the experimental groups was relatively greater than in the control group, the difference was not statistically significant. The only effects of M. piperita on testicular tissue was segmental maturation arrest in the seminiferous tubules; however, the effects of M. spicata extended from maturation arrest to diffuse germ cell aplasia in relation to the dose.

Hello everyone. Sorry for the long intro but I'm eager for your thoughts. I don't eat completely raw so I'm not sure where else to put this topic. Due to several reasons, I still eat most of food cooked but last year when 60-70% raw for a week or so, some of hard plaque started to chip off. But I had to discontinue the diet and so only ate raw fish few times a week- plaque returned soon.

Recently, I noticed darker areas of tooth, especially on all my bottom molars, near the gum (looks like a thin stripe). I don't know when this started happening but I think its connected to another change in diet:

From nearly half a year this was my diet:
-nearly paleo/primal (occasional dairy from grassfed cheese),
-grainfed meat, small intake of bad PUFAs (family insists on using vegetable oil)
-VLC, carbs mainly came from vegetables, avocado, and very rarely, blueberries
-90% cooked, raw animal food a few times a week in form of sashimi

When summer started, I went to live at a relative's home in a subtropical country
-1 serving of fruit 3-5 times a week (guava, wax apple, coconut, durian etc,)
-pretty much no raw meat/fish
-One 24-30 hr fast a week
-no grains but I probably had higher intake of bad PUFAs/sodium due to relative's cooking style
-no cheese but I ate grassfed butter
-less fresh seafood (canned fish)

Other stuff: Stress/sleep/exercise time improved during summer and I brush teeth with water only. I also take no supplements (hard to get where I live and I can't afford them). Getting hold of organ meats is also hard so I rarely eat any organs.

I think the long period without sweet fruit, and then suddenly adding some fruit back in was the main factor in causing the enamel loss. Before summer though, I already had a little enamel loss for while (1-2 years before seriously eating paleo) on my front teeth. I also didn't get a sugar rush after the fruit and I usually ate higher Gi fruit with some fat. And even after I eating primal/paleo, I still have hard white plaque forming behind my front teeth. Any theories/suggestions?

btw i posted similar topic at:
http://www.marksdailyapple.com/forum/showthread.php?11458-cause-of-enamel-loss
to get more ideas about whats wrong with my teeth. Its possible that acid reflux may be eroding my teeth but I still think my diet played a role. i don't know