I asked this question before. Peat said "Avoiding PUFA, having lots of fruit, some liver for vitamin A, and supplementing thyroid if it's needed."
A very general answer, and there is a reason for that. There really isn't much specificity, in terms of hormone modulation in nature. You can't just increase DHT, without increasing, or modulating testosterone, progesterone, and other hormones. When the whole body changes, DHT changes, but it doesn't happen the other way around, unless you are taking exogenous DHT, which I don't recommend, because it will shut your HPTA down. But, HRT docs are finding that DHT is far more effective than testosterone for men with impotence, and other hormonal issues. I guess its because it can't be aromatized and it is a potent saturated androgen.