People become unsettled with change, weight is an obsession with some, when they see those around them losing weight there is a mixture of concern/jealousy when gaining weight there is concern/smugness, in both cases there is always gossip. overall if you have spent a lot of your life a certain size, everyone becomes used to it. I cant argue though losing a lot of weight can cause skin to sag more which can be ageing but its a small price to pay for feeling happier and healthier. You have probably become more confident which is another element of the new you they have to get used to. They will get used to it