# the research does not take into consideration the hormonal changes between the phases > "Yet this three-phased model disregards the hormonal changes punctuating the transitions from oestrogen dominance (late follicular phase) to ovulation, then to a greater hormone level phase where both oestrogen and progesterone are prominent (luteal phase), and finally returning to menstruation."[[(Bruinvels et al., 2022)#^0hppk]] - I’d also argue the transition from low oestrogen to initial increase - [[oestrogen has caffeine-like qualities]] - [[Concepts/21 Concepts/mid-cycle PMS]]