I am a male, married for 2 years now and have a 6 month old baby boy. I’ve been following LCHF (Low carb-High Fat) diet for just 2 months only. But for the last 5 months, I feel I’ve lost my libido and erection. Erection does not last for more than 5 minutes. When I tested my testosterone 5 months before starting LCHF, it was only 221. My LCHF mentor told me not to worry about it (at that time, we’ve just had our baby and I didn’t notice my libido went down!). Now, even after 5 months, I’ve lost my libido and erection. My testosterone level has bit increased to 315 now. I am 35 years now. I tested my prolactin and it is within normal range 164 mIU/L (Lab range was: 86-390 mIU/L). I am aware my testosterone is very low, but I am confused as to how I was very effective in sex just 5 months before and now down to zero. Will testosterone drop that fast ? Or is it anything to do mentally ?

I am NOT obese (5’8″ and only 68Kg), NOT diabetic ever (95 Fasting Blood sugar and HbA1C 5.2%), Blood pressure 135/85. Triglycerides just 68. My full blood count (Blood work) is fine and am NOT anemic (haemoglobin 15.8 – Lab range was: 12.0-17.50). Thyroid function is normal. Kidney and liver functions are also normal as well – all according to the recent blood report taken on 24th April. I’ve had epilepsy twice in life around 6 years before and on epileptic pills for the last 5 years (Tegretol and Frisium). Any doctor can help kindly as this is really making emotional. Thank you all for your time.