When you're a person who's used to eating meat and protein daily to fuel your body and you suddenly cut off that fuel source your body has to find other sources of energy to use. It'll start utilizing stored fat AND muscle for energy.
Bottom line: if you're used to eating meat frequently and you suddenly switch to another less plentiful fuel source, your body is going to start digging into reserves of fat (essentially stored pockets of back up energy) and muscle making you feel hungry even more often.
Yes, I'm seous.
No, sorry, you still have no fucking idea what you're talking about.
Your body doesn't say, "Hey, what's up with all this vegan food?" Your body doesn't know vegan vs. non-vegan. It just knows CALORIES.
Your body calculates calories. When you receive less calories than are required to sustain your daily activities, it begins to cut into your fat stores. If your diet consists of potato chips, Coke, and Oreos (all vegan), trust me when I say that you will have plenty of excess calories.
I weigh more than I did back when I ate meat, and I've been vegan for 3 years. Broccoli and garlic sauce will do that to you.