Table 44.

Effects of Soy Milk Consumption on Menstrual Cycle Length and Hormones^a

	Months after soy milk consumption phase
Parameter	0 (During)	1	2–3
Menstrual cycle length	"↑" (P = 0.06)	"↑" (P = 0.11)	↔
Serum 17β-estradiol
Cycle average	↓	↓	"↓" P = 0.11
Cycle days
5–7	"↓" (P = 0.09)	↔	↔
12–14	↓	"↓" (P = 0.056)	↓
20–22	↓	↓	"↓" (P = 0.24)
Serum progesterone, luteal phase	↓	↔	↔
Serum dehydroepiandrosterone sulfate, cycle average	↓	↔	↑" (P = 0.08)

^an = 4–6 subjects per time period. ↑,↓,↔ increase, decrease, or no change compared to baseline value at P ≤ 0.05 by paired t-test. "↑," "↓" increase or decrease described by study authors with P >0.05.

From Lu et al. (1996).