Is it true that following a diet in which there are no food intolerance you can lose weight?

It has been observed that the food intolerance can cause disturbances to metabolism with changes in weight is in excess of that in defect.
By removing these foods and then controlling them the metabolism will be active with a loss of body mass

It 'possible that the Food intolerances can cause a wide range of disorders ?

Yes.
Food intolerances cause a state of inflammation that can spread to reach, various organs. In addition, all inflammatory conditions may worsen due to ongoing Intolerance.

I have heard about Food Allergy and Food Intolerance. Are they the same ?

No.
Allergies are related to the production of immunoglobulin class IgE and symptoms appear within a short period of time from the assumption of the food (urticaria, disorders of the mucous membranes, nausea, vomiting, etc..). Food intolerance is related to the production of immunoglobulin IgG. The disorders are manifested in a long time with a tendency to become chronic.

If am I intolerant to a food, should I must eliminate it forever from my diet ?

No.
Intolerance to a food can be of three different levels: First Second and Third. The test result may be specific to what degree is your intolerance for certain food. Together with the outcome of the test will be given specific guidance for its gradual reintroduction.