morning run advice

Hi i am currently quite underweight and trying to gain some muscle  and having a hard enough time with that fact alone but ive recently been doing runs in the morning first thing when i wake up,but i herd that if you workout without eating anything first it will cause your body to cannibalize your muscle and protein for energy. Is this true? Should I have something before I go on my run to save my muscle.

No, that's not true, but it's beside the point.

Short answer: If you are underweight, you should do the following two things:

1. Eat more.

2. Lift heavy weights, regulary.

I assume that you understand that your running is burning lots of calories, and that if you don't eat enough, you will stay scrawny, or get scrawnier. Your body won't divert energy to build muscle if you don't give it enough to sustain your activities. Building muscles is a low priority (as opposed to, you know, keeping your organs functioning), so you have to give your body enough energy cushion (food) and the impetus to do so (lifting). 

Maybe you should try and run at a different time - I tried running in the mornings but I just can't. I still feel sleepy and sluggish, so I tend to go running in the late afternoons/early evenings. I feel like my muscles are still asleep in the morning :p

thanks i have been doing lifting though for about 2 months and still no gains

 Knock it off with the running entirely. More than 90 minutes of cardio a week makes it appreciably harder to put on muscle, and not just because you have to eat your frickin' head off to compensate.

 If you're training to gain muscle, you need to lift hard and eat calories in excess of maintenance. Running burns calories, and all it does for you is make you need to eat more.

 You can geek out like me and try to optimise every detail, but at the heart of it it's pretty simple - if you're not gaining on your current intake, you need to eat more.

vegmatt, if you're having a hard time gaining weight, i'd suggest cutting out all exercise.  try to eat more and see if you can get the scale to move a couple pounds.  once you see how much you need to eat to gain weight (A LOT), try incorporating a little strength training and even MORE food.  you'll gain some much-needed muscle and much-needed awareness about your body's nutritional needs. 

thanks, i know i need to cut back and i have been, cause running is just a fraction of the cardio i do.but some things i can't just drop like soccer, because i am dedicated to the team ya know. but i do think my being underweight is affecting my performance and ive herd of athletes that gain a few pounds and it actually boosts their performance to the next level.

 Ah, soccer. You're running to improve performance on the field then?

 Drop steady state runs entirely, do sprint interval training instead - it's closer to your game performance profile and will have a positive carryover to your on-field performance, unlike steady state running. If you're going to do any extra cardio at all that is, which isn't a given - soccer is plenty on its own.

 Do you have a specific strenght program you're following? I'd recommend a sports-specific training program if I knew of any. In lieu of that, check out Sean10mm's "stripped" 5x5 routine - personally I lean more in the Mark Rippetoe Starting Strength direction for beginners to lifting, but there's only minor differences between them.