"You are a special case so I can't say for sure, but I think it has something to do with our technique and the presence of the blood core," Keith replied.
"So I have to eat in order to maintain my strength." Rena said.
"You don't have a central power source that can store the life energy on behalf of the entire body so your muscles bear all the burden. That's why you need to eat every day to maintain your power.
"On that note, even if you don't eat the body will consume the life energy in your muscle to keep you going until you get to your original life energy," Keith explained.
Unlike Keith, Rena's physique was different and the differences were striking. Keith being a vampire had a slower heartbeat compared to her. His blood-qi technique preserved energy better as opposed to the lack of any technique for Rena.
