What is my ideal race weight?

Race at what allows you to continue to train consistently and healthily.

Seems like what you have been doing is already working very well for you, don't sell your soul to the weightloss devil.

I think the correct answer is to figure out how to run an effective experiment on yourself. Run a time trial at weight A. Run a time trial at weight B. Run another time trial at weight A.

try to make weight your only different variable to the extent possible.

try to also have the same nutrition the 24 hours leading up to your time trial. (I.e. eat as calorie-rich the night before, and the morning of, no matter whether you are at your lower weight or your meatier weight.)

you want to have confidence that you’re not making important decisions based only on ideology or guessing.

i suspect the correct weight can’t be known in advance. While the best runners are often absurdly skinny, we do not always see the carnage along the way (the people who tried to get the best out of themselves by going three pounds lower, and their body was full of fatigue and malnourishment).

if someone can jump in who has a mind for designing effective experiments, I’m sure we could improve on the idea. It’s not my strong suit.

i do think that if you go too calorie dilute for a man, his sex hormones start to resemble that of a female. (Ryan hall says his testosterone was absurdly low at the end of his career), which is probably not advantageous for performance. If a woman goes too calorie dilute, her sex hormones start to resemble that of a child. (Also not advantageous.)

ok, I’m way out of my depth in saying any of that, (talking out my behind about sex hormones).

anyone have a mind for experiment design?

Threeve

If you're actually a mid distance runner you should get some muscle and get to the 140s as under 130 for someone near six foot is underweight.

I agree. I’m 5’4 and 135ish.

Not this s**t again. Don’t be ashamed of your mental health issues - it’s ok for you to seek help! Take the first step.

If you were 10-15 pounds heavier, you might be onto something, but given that the margins you're talking about are pretty fine, I don't think you need to be concerned with weight.

You're 19, so I'm guessing you're still in the process of increasing mileage and adapting to more strenuous training. You're going to need lots of calories, if you want that training to be productive.

As long as you eat a fairly healthy balanced diet (not gorging yourself on junk), then I'd focus more on working hard in training, as opposed to cutting back calories - in order to improve performance.

Your weight is fine, don't worry about it. I was about the same as you were...........40 years ago at 5'10" and 140lbs. I ran similar times on tracks that weren't as good as today and with shoes/spikes that were good but not as good as what is available now.