Allergies are the result of a hypersensitive immune system. The allergic immune system misidentifies an otherwise innocuous substance as harmful, and then attacks the substance with a ferocity far greater than required.
Laying off an employee is different from firing an employee. Firing means letting a worker go for any reason, whereas a layoff refers to an employment termination based on economics, usually involving more than one worker.
So, keeping the weight off has more to do with how you start the weight loss process than how you finish it. To that end, you have to set yourself up for success and to do that you'll need to find a few things: A Way of Eating You Can Live With for the Long Term.