Sex Differences in Attention and Attitude Toward Infant and Sexual Images.

Reproduction in mammals includes two general categories of behaviors: mating and parenting. Historically and cross-culturally, men invest more than women in mating; women invest more than men in parenting. Sex differences in attention and attitude toward mating and parenting stimuli have rarely been assessed together despite theoretical interest. To evaluate these differences simultaneously in a naturalistic setting, 582 study participants (459 women, 123 men) were presented with sexual and infant images, online in the privacy of their home, at three time periods spanning several weeks for a more reliable result. Attention was measured by covertly recording viewing time of images using Qualtrics software, and attitude was measured via self-report after each viewing session. Men reported a more positive attitude than women toward the sexual images; women reported a more positive attitude than men toward the infant images. Women viewed the infant images marginally longer than did men, and the infant-to-sexual viewing ratio was larger for women. The sexual-to-infant viewing ratio was larger for men than for women. Unexpectedly, both genders viewed the sexual images longer than the infant images, with no significant gender difference in the sexual image viewing time. The results suggest that women and men may give equal attention to visual sexual stimuli despite self-reported sex differences in interest. The possibly underestimated valence of visual sexual stimuli for women is discussed.

Ingestion of Steamed and Dehydrated Placenta Capsules Does Not Affect Postpartum Plasma Prolactin Levels or Neonatal Weight Gain: Results from a Randomized, Double-Bind, Placebo-Controlled Pilot Study.

INTRODUCTION: Clinical studies conducted in the early to mid-twentieth century, and recent self-reports by some maternal placentophagy practitioners, suggest that human maternal placentophagy improves breast milk quality and quantity, although little research has evaluated this claim. Some placentophagy providers and advocates suggest that increased prolactin levels after placenta ingestion could account for the purported lactation benefits. The current study was conducted to evaluate these claims by comparing plasma prolactin levels of women consuming steamed, dehydrated, and encapsulated placenta with those of women consuming a placebo. Neonatal weight gain was also compared between the 2 groups. METHODS: A randomized, double-blind, placebo-controlled pilot trial was conducted in which postpartum women (N = 27) were given a supplement containing their dehydrated placenta (n = 12) or placebo (n = 15). Plasma prolactin concentrations were measured 4 times across late pregnancy and early postpartum, and neonatal weights were recorded 3 times over the first 3 weeks postpartum. RESULTS: The results showed no statistically significant (P < .05) differences in either plasma prolactin levels or neonatal weight gain between groups. DISCUSSION: Maternal consumption of steamed, dehydrated, and encapsulated placenta postpartum does not appear to affect maternal postpartum prolactin or neonatal weight in the first 3 weeks postpartum. Further research is needed to investigate the possible effects of variation in placenta preparation methods or daily intake on human lactation.

Placentophagy's effects on mood, bonding, and fatigue: A pilot trial, part 2.

BACKGROUND: Human maternal placentophagy is gaining popularity among a growing number of women who believe it provides maternal benefits, including prevention of postpartum blues/depression, improved maternal bonding, and reduced fatigue. METHODS: We conducted a randomized, double-blind, placebo-controlled pilot study (N=27) in which participants consumed either their processed, encapsulated placenta (n=12), or similarly prepared placebo (n=15). Maternal mood, bonding, and fatigue were assessed via validated scales across four time points during late pregnancy and early postpartum. Psychometric data were analyzed for changes between and within both groups over time. RESULTS: No significant main effects related to maternal mood, bonding, or fatigue were evident between placenta and placebo group participants. However, examination of individual time points suggested that some measures had specific time-related differences between placenta and placebo groups that may warrant future exploration. Though statistical significance should not be interpreted in these cases, we did find some evidence of a decrease in depressive symptoms within the placenta group but not the placebo group, and reduced fatigue in placenta group participants at the end of the study compared to the placebo group. CONCLUSIONS: No robust differences in postpartum maternal mood, bonding, or fatigue were detected between the placenta and placebo groups. This finding may be especially important for women considering maternal placentophagy as a 'natural' (i.e., non-pharmacological) means of preventing or treating blues/depression. Given the study limitations, these findings should be interpreted as preliminary. Small, time-related improvements in maternal mood and lower fatigue post-supplementation among placenta group participants may warrant further research.

Effects of placentophagy on maternal salivary hormones: A pilot trial, part 1.

BACKGROUND: Recent studies show that human placenta, processed and encapsulated for postpartum consumption, contains a host of trace minerals and hormones that could conceivably affect maternal physiology. Our objective was to investigate whether salivary hormone concentrations of women ingesting their own encapsulated placenta during the early postpartum differed from those of women consuming a placebo. METHODS: Randomly assigned participants (N=27) were given a supplement containing either their dehydrated and homogenized placenta (n=12), or placebo (n=15). Saliva samples were collected during late pregnancy and early postpartum. Samples of participants' processed placenta, and the encapsulated placebo, were also collected. Hormone analyses were conducted on all samples utilizing liquid chromatography-tandem mass spectrometry. RESULTS: There were no significant differences in salivary hormone concentrations between the placenta and placebo groups post-supplementation that did not exist pre-supplementation. There were, however, significant dose-response relationships between the concentration of all 15 detected hormones in the placenta capsules and corresponding salivary hormone measures in placenta group participants not seen in the placebo group. The higher salivary concentrations of these hormones in the placenta group reflects the higher concentrations of these hormones in the placenta supplements, compared to the placebo. CONCLUSIONS: Some hormones in encapsulated placenta lead to small but significant differences in hormonal profiles of women taking placenta capsules compared to those taking a placebo, although these dose-response changes were not sufficient to result in significant hormonal differences between groups. Whether modest hormonal changes due to placenta supplementation are associated with therapeutic postpartum effects, however, awaits further investigation.

Effects of Human Maternal Placentophagy on Maternal Postpartum Iron Status: A Randomized, Double-Blind, Placebo-Controlled Pilot Study.

INTRODUCTION: Advocates of human maternal placentophagy report that encapsulated placenta is an excellent source of dietary iron. Our study compared the effect of ingested encapsulated placenta on maternal postpartum iron status versus that of a beef placebo. METHODS: A randomized, double-blind, placebo-controlled pilot study (N = 23) was conducted among healthy human research participants experiencing a normal pregnancy. Maternal iron status was measured via hemoglobin, transferrin, and ferritin taken from blood samples drawn in the participants' homes at 4 time points: the 36th week of pregnancy, within 96 hours of parturition, between days 5 and 7 postpartum, and during week 3 postpartum. Iron concentrations in the encapsulated placenta and encapsulated beef placebo were compared using inductively coupled plasma mass spectrometry. RESULTS: Seventy-eight percent (18/23) of study participants' hemoglobin concentrations were above the World Health Organization cutoff for gestational iron deficiency (≥ 11.0 g/dL) during the 36th week of pregnancy. Results revealed no statistically significant differences (hemoglobin, P = .603; ferritin, P = .852; transferrin, P = .936) in maternal iron status (including postpartum iron rebound in the first week postpartum) between women in the placenta supplement (n = 10) and placebo (n = 13) groups. Average iron concentrations were considerably higher in encapsulated placenta (0.664 mg/g) compared to the encapsulated beef placebo (0.093 mg/g) but provided only 24% of the recommended daily allowance (RDA) for iron among lactating women based on the study's maximum daily intake. DISCUSSION: The current study suggests that encapsulated placenta supplementation neither significantly improves nor impairs postpartum maternal iron status for women consuming the RDA of dietary iron during pregnancy and lactation, compared to a beef placebo. This may be an especially important finding for women who are iron deficient postpartum and whose only source of supplemental dietary iron is encapsulated placenta, as this may provide an inadequate source of supplemental iron in cases of deficiency.

Human placenta processed for encapsulation contains modest concentrations of 14 trace minerals and elements.

Maternal placentophagy has recently emerged as a rare but increasingly popular practice among women in industrialized countries who often ingest the placenta as a processed, encapsulated supplement, seeking its many purported postpartum health benefits. Little scientific research, however, has evaluated these claims, and concentrations of trace micronutrients/elements in encapsulated placenta have never been examined. Because the placenta retains beneficial micronutrients and potentially harmful toxic elements at parturition, we hypothesized that dehydrated placenta would contain detectable concentrations of these elements. To address this hypothesis, we analyzed 28 placenta samples processed for encapsulation to evaluate the concentration of 14 trace minerals/elements using inductively coupled plasma mass spectrometry. Analysis revealed detectable concentrations of arsenic, cadmium, cobalt, copper, iron, lead, manganese, mercury, molybdenum, rubidium, selenium, strontium, uranium, and zinc. Based on one recommended daily intake of placenta capsules (3300 mg/d), a daily dose of placenta supplements contains approximately 0.018 ± 0.004 mg copper, 2.19 ± 0.533 mg iron, 0.005 ± 0.000 mg selenium, and 0.180 ± 0.018 mg zinc. Based on the recommended dietary allowance (RDA) for lactating women, the recommended daily intake of placenta capsules would provide, on average, 24% RDA for iron, 7.1% RDA for selenium, 1.5% RDA for zinc, and 1.4% RDA for copper. The mean concentrations of potentially harmful elements (arsenic, cadmium, lead, mercury, uranium) were well below established toxicity thresholds. These results indicate that the recommended daily intake of encapsulated placenta may provide only a modest source of some trace micronutrients and a minimal source of toxic elements.

Presence and concentration of 17 hormones in human placenta processed for encapsulation and consumption.

Human maternal placentophagy is a rare but growing practice in several industrialized countries among postpartum mothers seeking a variety of purported health benefits attributed to the practice. These postpartum mothers typically consume their placenta as a processed, encapsulated supplement. To determine whether free (unconjugated) steroid hormones and melatonin in placenta can survive the encapsulation process (namely steaming and dehydration), we analyzed 28 placenta samples processed for encapsulation using liquid chromatography tandem-mass spectrometry (LC-MS/MS) to evaluate the concentration of 17 hormones. The results revealed detectable concentrations for 16 of the hormones analyzed, some in concentrations that could conceivably yield physiological effects.

Human maternal placentophagy: a survey of self-reported motivations and experiences associated with placenta consumption.

Maternal placentophagy, although widespread among mammals, is conspicuously absent among humans cross-culturally. Recently, however, advocates for the practice have claimed it provides human postpartum benefits. Despite increasing awareness about placentophagy, no systematic research has investigated the motivations or perceived effects of practitioners. We surveyed 189 females who had ingested their placenta and found the majority of these women reported perceived positive benefits and indicated they would engage in placentophagy again after subsequent births. Further research is necessary to determine if the described benefits extend beyond those of placebo effects, or are skewed by the nature of the studied sample.

The conspicuous absence of placenta consumption in human postpartum females: the fire hypothesis.

The absence of human placentophagy, the maternal consumption of the afterbirth, is puzzling given its ubiquity and probable adaptive value in other mammals. We propose that human fire use may have led to placentophagy avoidance in our species. In our environment of evolutionary adaptedness, gravid women would likely have been regularly exposed to smoke and ash, which is known to contain harmful substances. Because the placenta filters some toxicants which then accumulate there across pregnancy, maternal placentophagy may have had deleterious consequences for the overall fitness of mother, offspring, or both, leading to its elimination from our species' behavioral repertoire.

In search of human placentophagy: a cross-cultural survey of human placenta consumption, disposal practices, and cultural beliefs.

Maternal placentophagy, the consumption of the placenta or "afterbirth" by the mother following parturition, is an ubiquitous behavior among eutherian mammals, including non-human primates. Here we report on a cross-cultural survey of 179 human societies regarding the consumption, treatment, and disposal of human placenta, in addition to accompanying cultural beliefs and perceptions about the organ. The conspicuous absence of cultural traditions associated with maternal placentophagy in the cross-cultural ethnographic record raises interesting questions relative to its ubiquitous presence among nearly all other mammals, and the reasons for its absence (or extreme rarity) among prehistoric/historic and contemporary human cultures.