Some recent studies have suggested that the glycemic index and glycemic load are not important. The following study shows that this is due to under-reporting of food intake.
Positive association where found between GI, GL, and BMI.
Obese subjects are highly likely to under report their energy intake. Studies that ignore this are somewhat suspect.
This study out of Mexico shows the negative relationship between obesity and testosterone levels. SHBG was also lower and insulin higher in the obese group.
Fat cells are more metabolically active than once thought and produce many inflammator factors and some hormones…including estrogen metabolites. This, in combination with reduced androgen levels, is most likely a contributing factor of the increase in ED in obese men.
Chinese researchers report positive results using acupuncture for abdominal obesity. Improvements were seen for BMI, waist circumference and WHR.
The mechanism for this improvement is unknown, but may be related to stress reduction. Cortisol is a known appetite stimulant and also disrupts insulin sensitivity….which is highly correlated with WHR.
PMID: 16941971
Another study has demonstrated the relationship between visceral fat and insulin resistance.
The researchers conclude that visceral fat causes insulin resistance. But what causes visceral fat? Insulin resistance is the primary factor. See my VAT write up for more info:
Visceral Adipose Tissue