General

So, a couple of things I wanna clarify first before someone gets the wrong idea.

When OP says "food consumption extraordinarily increases testosterone in is, thus the horniness after eating", they are referring to the fact that testosterone increases when aroused for all sexes. Mind you this is not a permanent change. Your levels go back down when your bathing in the afterglow. Everyone experiences no matter how kinky or vanilla you are.

Here's a link that explains this further: psychology.fandom.com/wiki/Testosterone_and_sexual_arousal

Now, to answer OP's original question, there is a link between insulin and DHT.

For those who don't know, DHT (Dihydrotestosterone), is a hormone derived from testosterone. Everyone has DHT - it isn't an inherently bad thing. But when it gets out of balance, it causes problems. Check these out for more information:

psychology.fandom.com/wiki/Testosterone_and_sexual_arousal

psychology.fandom.com/wiki/Testosterone_and_sexual_arousal,men.%20It%20also%20boosts%20libido%20and%20sexual%20health.

Now, the main link between DHT and insulin is male pattern baldness. It's a bit of a chicken and egg situation. It isn't clear if there is causation - let alone which one causes which - but there is a well-established correlation. In fact, if you've been diagnosed with early-onset male pattern baldness, there is a high likelihood you may develop type II diabetes.

Here are some links on the topic for those who want more:

psychology.fandom.com/wiki/Testosterone_and_sexual_arousal

psychology.fandom.com/wiki/Testosterone_and_sexual_arousal

psychology.fandom.com/wiki/Testosterone_and_sexual_arousal