I feel hunger already and have done for the last 2 weeks - I'm now 7.5 weeks post bypass. I put it down to no longer being in ketosis. I was def in ketosis as my wife knows what that smells like (my breath gets bad). A day after I started to feel hungry, she mentioned the smell was gone. I'm sure this is why so many folk aren't hungry while the weight flies off - they're in ketosis. Luckily so far my weight is still coming off and I can just ignore the hunger.