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R.B. · 07-16-2006, 05:25 AM

Here is another trail this time with reference to sexuality "sexual receptivity".

There must be one or more factors in dietary intake that control this function.

GUESSWORK.

The most likely is fat as this is the most common indicator in human terms as to food availabilty.

DHA / AA would also make sense as being the scarecest / most necessary to reproduction.

In todays world DHA (and EPA and ALA) is the most likely to be in short supply.

See posts on omega threes and sixes, greek diet, cancer diet etc if an area not fully considered and of interest.

http://www.ncbi.nlm.nih.gov/entrez/q..._uids=15528398

1: Am J Physiol Regul Integr Comp Physiol. 2004 Dec;287(6):R1277-96.Click here to read Links
Neuroendocrinology of nutritional infertility.

* Wade GN,
* Jones JE.

Center for Neuroendocrine Studies, University of Massachusetts, 135 Hicks Way, Amherst, MA 01003, USA. gwade@cns.umass.edu

Natural selection has linked the physiological controls of energy balance and fertility such that reproduction is deferred during lean times, particularly in female mammals. In this way, an energetically costly process is confined to periods when sufficient food is available to support pregnancy and lactation. Even in the face of abundance, nutritional infertility ensues if energy intake fails to keep pace with expenditure. A working hypothesis is proposed in which any activity or condition that limits the availability of oxidizable fuels (e.g., undereating, excessive energy expenditure, diabetes mellitus) can inhibit both gonadotropin-releasing hormone (GnRH)/luteinizing hormone secretion and female copulatory behaviors. Decreases in metabolic fuel availability appear to be detected by cells in the caudal hindbrain. Hindbrain neurons producing neuropeptide Y (NPY) and catecholamines (CA) then project to the forebrain where they contact GnRH neurons both directly and also indirectly via corticotropin-releasing hormone (CRH) neurons to inhibit GnRH secretion. In the case of estrous behavior, the best available evidence suggests that the inhibitory NPY/CA system acts primarily via CRH or urocortin projections to various forebrain loci that control sexual receptivity. Disruption of these signaling processes allows normal reproduction to proceed in the face of energetic deficits, indicating that the circuitry responds to energy deficits and that no signal is necessary to indicate that there is an adequate energy supply. While there is a large body of evidence to support this hypothesis, the data do not exclude nutritional inhibition of reproduction by other pathways and processes, and the full story will undoubtedly be more complex than this.

PMID: 15528398 [PubMed - indexed for MEDLINE]

07-16-2006, 05:25 AM	#7
R.B. Senior Member Join Date: Mar 2006 Posts: 1,843	Here is another trail this time with reference to sexuality "sexual receptivity". There must be one or more factors in dietary intake that control this function. GUESSWORK. The most likely is fat as this is the most common indicator in human terms as to food availabilty. DHA / AA would also make sense as being the scarecest / most necessary to reproduction. In todays world DHA (and EPA and ALA) is the most likely to be in short supply. See posts on omega threes and sixes, greek diet, cancer diet etc if an area not fully considered and of interest. http://www.ncbi.nlm.nih.gov/entrez/q..._uids=15528398 1: Am J Physiol Regul Integr Comp Physiol. 2004 Dec;287(6):R1277-96.Click here to read Links Neuroendocrinology of nutritional infertility. * Wade GN, * Jones JE. Center for Neuroendocrine Studies, University of Massachusetts, 135 Hicks Way, Amherst, MA 01003, USA. gwade@cns.umass.edu Natural selection has linked the physiological controls of energy balance and fertility such that reproduction is deferred during lean times, particularly in female mammals. In this way, an energetically costly process is confined to periods when sufficient food is available to support pregnancy and lactation. Even in the face of abundance, nutritional infertility ensues if energy intake fails to keep pace with expenditure. A working hypothesis is proposed in which any activity or condition that limits the availability of oxidizable fuels (e.g., undereating, excessive energy expenditure, diabetes mellitus) can inhibit both gonadotropin-releasing hormone (GnRH)/luteinizing hormone secretion and female copulatory behaviors. Decreases in metabolic fuel availability appear to be detected by cells in the caudal hindbrain. Hindbrain neurons producing neuropeptide Y (NPY) and catecholamines (CA) then project to the forebrain where they contact GnRH neurons both directly and also indirectly via corticotropin-releasing hormone (CRH) neurons to inhibit GnRH secretion. In the case of estrous behavior, the best available evidence suggests that the inhibitory NPY/CA system acts primarily via CRH or urocortin projections to various forebrain loci that control sexual receptivity. Disruption of these signaling processes allows normal reproduction to proceed in the face of energetic deficits, indicating that the circuitry responds to energy deficits and that no signal is necessary to indicate that there is an adequate energy supply. While there is a large body of evidence to support this hypothesis, the data do not exclude nutritional inhibition of reproduction by other pathways and processes, and the full story will undoubtedly be more complex than this. PMID: 15528398 [PubMed - indexed for MEDLINE]