“Is Prediabetes Damaging Sperm and Causing Fertility Problems?...Research published in October 2018 in the medical journal BJU International found a potential link between male infertility and undiagnosed prediabetes…increased exercise and different nutritional choices, can help lower blood glucose levels into the nondiabetic range…people who meet any of the following criteria are more likely to have prediabetes…Weighing over the recommendation for your height…Age in the mid-forties or older…A close family member with type 2 diabetes…Exercising less than three times a week…African-American, Hispanic/Latino, Native American, Pacific Islander, and some Asian American ethnicity…‘we showed for the first time the negative association between a prediabetes status and the impaired hormonal, metabolic, and seminal profile of infertile men,’ says Dr. Boeri…‘Prediabetes is a common but underdiagnosed condition in the general population and infertile men’…”
(Everydayhealth.com, Nov. 30, 2018)
Along with the above, it has been found that a major step in avoiding diabetes related problems is to shun cane sugar, high-fructose-corn-syrup, white potatoes, white flour, etc. Keep fruit juices to a limited amount, or dilute with much water. Eat enough protein with carb meals. It also helps to eat regular, timely meals, to avoid “sugar crashes” (unless fasting).
Also, eating some vinegar directly before (or during) meals (as well as before bedtime at night) is a great help, according to modern research (as well as Biblical pattern):
“Eleven subjects with DM2 consumed vinegar or placebo (at random order on two separate days, a week apart), before a mixed meal…vinegar reduces postprandial hyperglycaemia, hyperinsulinaemia, and hypertriglyceridaemia without affecting lipolysis. Vinegar's effect on carbohydrate metabolism may be partly accounted for by an increase in glucose uptake, demonstrating an improvement in insulin action in skeletal muscle...The consumption of vinegar with meals was used as a folk medicine for the treatment of diabetes before any pharmacologic glucose-lowering therapy…Recent studies indicate that vinegar improves insulin sensitivity in healthy volunteers, as well as in subjects with diabetes…In addition, vinegar ingestion at bedtime has been shown to decrease fasting glucose levels in humans with type 2 diabetes, suggesting an effect of acetic acid on endogenous glucose production…previous studies indicate that acetate may also decrease circulating lipid levels…and protect from lipid accumulation in liver and skeletal muscle…”
(J Diabetes Res. 2015; 2015)
[Check out some other studies and healthy ways to avoid or remedy diabetes under “diabetes” on this site – such as eating lots of cinnamon, daily, etc.]
Many people who have "pre-diabetes," may not be aware. Abnormal "crashes," irritability before meals, the desire to eat too much during meals, etc., can be signs.