Weight Loss Concern

What's good you filthy animals. I'm looking at starting NOBO in April but having some concerns with the amount of weight I would lose likely very quickly on trail. I'm 5'11 155-160lbs. I've done the Tahoe Rim Trail and John Muir Trail in the past but never anything close to a real through hike.

Would anyone like to weigh-in on this topic for me? 😉