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.
There are jobs that after a while u will build muscle or lose weight from just the intestity of the job like construction workers or land scapers, but being a weitress only will not get you the results u desire.