Why do people with GERD lose weight?

Is this do to an upset stomach/digestive problems related to Acid Reflux?

The two larger reasons are because of anxiety causing them to eat less, or the restrictive dieting. Here is some more information on Gerd to help you to understand.

I am not a doctor, so either way you will want to talk to them, but this is what I have to say as a long time sufferer of Acid Reflux (G.E.R.D.)!

Three part answer: information, what not to do, and what to do!

INFORMATION!!!!!!
I have a very severe case of Acid Reflux (G.E.R.D.). I have had to go to the hospital for some of the heartburn that I have had because the pain can become overwhelming or your breathing can be effected. It can be caused by Smoking, Drinking Beverages with caffeine (My case with hereditary), Drinking Beverages with Alcohol, Stress, Anxiety or can be Hereditary

The good thing about G.E.R.D. is that it can be a temporary thing and can be cured. It is never a permit thing even if you end up with it for the rest of your life it has the ability to be cured.

G.E.R.D. is caused by too much acid being created in your stomach. This can lead to or cause ulcers, esophagus damage, heartburn and/or damage in the mouth. . Other symptoms that can be found in a few cases are dizziness, tingling in limbs, numbness of Limbs, Chest/Back pain focused on the left side (in most cases), and shortness/difficulty breathing.

WHAT NOT TO DO!!!!!!!!
In most cases, stress is a factor to the reflux if you watch what you eat and reduce some of the stress it will help. If you watch what you eat for about a week you should find relief, if you do not then that is when you definitely what to listen to the doctor. Things to watch for are as follows:

Fatty Foods
Citrus Foods
Foods That Contain Grease
Fried Foods
Chocolate (including any Coco)
Caffeine
Smoking
Alcohol
Tomato Based Products
Lactose
Roughage (Berries and Nuts)
Onions

WHAT TO DO!!!!
The two foods that I recommend is Black strap Molasses and Raw honey. The apple is better for night time reflux while these will work for just about all of it. What you will do is take about a tsp. of whatever one you chose. Molasses being the better because of strength and nutrition, but must be use to the taste. What the substance will do is stick to the sides of the esophagus and do two things, one is heal and the other is protect.
On the healing end, both substances have a healing property in them, and as they sit on the walls of the esophagus they will heal it. This is also helpful if you have a sore throat in the morning from refluxing.
On the protection end, both substances are high in sugar and when acid that is refluxed comes up to that the sugar will neutralize it and it will not longer be a problem at that point.

I would also look to putting Cinnamon and Ginger in you diet, they have been know to help with digestion and will help you reduce the amount of acid needed to brake down food, therefore causing you to reflux less.

Yes, anorexia (anorexia nervosa is the psychological disorder ... anorexia is the lack of desire to eat.)

They simply are afraid or have no desire to eat because of the pain that follows.

The pain is SO intense that some patients will seek out oral narcotics to help with the pain ... which upsets the GI track ... which starts the whole pain cycle all over again.

Sad disorder