Best Macro ratio for sparing muscle

VeinsAndBones

Hi I'm soon going to be going to the gym (Biking there approx ~6miles there and back) 5 days a week, doing Strong Lifts "5x5" routine.... What kind of caloric/macronutrient consumption am I going to need to prevent muscle loss?
Height: 5ft 10.51in
Weight: 131.5lbs
Age 18
Body fat: ~15.35% according to Fat2Fitradio.com But ~18.15% according to IIYFYM.com
I currently am sedentary and avg about 1550-1600 calories a day with my macros being (Carbs: 20% Protein: 30% Fat: 50%)

jayche

I'd suggest that you up your carbohydrates.

ChloeRoseLejeune

How are you sedentary if you bike 12 miles 5X a week?

VeinsAndBones

I'm going to start hitting the gym March 1st (that's when the equipment gets dropped off)

bacitracin

I'd suggest that you up your carbohydrates.

Why?

jayche

I'd suggest that you up your carbohydrates.

Why?

If you're really interested in why, I suggest you read this article by Layne Norton.
http://www.simplyshredded.com/layne-norton-the-most-effective-cutting-diet.html

Cliffs:
- "Carbohydrates help maintain muscle by increasing cell volume."
- "Low glycogen levels have been associated with increased fatigue and decreased performance in athletes (endurance, strength, power output, etc)." "This could lead to a subsequent loss of muscle mass due to decreased stimulation from a decreased training overload."
- "Dietary protein would be sacrificed for ATP production and the depleted amino acid pool would not bode well for protein synthesis rates, thus causing a net loss in muscle mass. (referring to low-carb dieting)"