It's all about variety in diet and exercise...vary your meals and workout periodically to keep the body 'guessing'.
But like anything - expect low and down period...nothing is perfect..
And as long as you're eating healthy and staying active - you have a healthy body!
Good sites for reference are
best exercise for quick weight loss
Fat Loss 4 Idiots
Turbulence Training
Burn The Fat Feed The Muscle
The Truth About Six Pack Abs
Top Secret Fat Loss Secret
Strip That Fat