hallibee:

The first question I have to ask is "Why do you need to be destructively tested for gluten intolerance?" There's no good reason for anyone to eat gluten grains, whether they meet the (ever-shifting) clinical definition of "intolerance", "celiac", or not...

...and eight weeks? Sounds like they want to do an intestinal biopsy, look for obvious damage, and if they don't find it (which they won't want to) they can tell you "See? You're fine, this 'intolerance' thing is all in your head, whole grains are healthy, blah blah blah."

The only reason I can think to get such a diagnosis is because you're Italian and get subsidized gluten-free stuff from the government, or you otherwise somehow get preferable health care/insurance treatment if formally diagnosed. Otherwise, it doesn't seem like it serves any purpose but to make you less healthy!

That being said, if you absolutely must, I'd do a few things:
1. Eat white bread, so the "healthywholegrainfiber" doesn't bind up nutrients in other meals you're eating
2. Eat the slices all at once, so your other meals are gluten-free
3. Eat them in the evening, because carbs for dinner is generally better than carbs for breakfast.
4. Eat them with an otherwise-complete meal containing plenty of fat, vinegar, etc. as per Paul Jaminet's article "How To Minimize Hyperglycemic Toxicity":
http://perfecthealthdiet.com/2011/10/how-to-minimize-hyperglycemic-toxicity/

JS

hallibee:

"No iodine-containing foods for a couple years" is silly. Yes, you shouldn't eat lots of iodine during the gluten challenge period, as it generally exacerbates the skin rash (through a mechanism no one actually understands).

However, iodine by itself does not cause the rash: only gliadin (the irritating part of gluten grains) does that. (Reference: Patinen 2002.) So it's silly to avoid shellfish and sea fish completely for years...that's not healthy at all! The doctors probably give that advice because so few people actually stick to gluten-free diets -- especially with gluten hiding in so many foods that shouldn't obviously have any.

EDIT TO ADD:
http://noglutenfoods.blogspot.com/2009/10/iodine-aiding-in-dermatitis.html
"When the deposits of IgA have been cleared from the skin over time by following a gluten free diet, iodine should no longer present any problem for dermatitis herpetiformis patients."
"It is not necessary for dermatitis herpetiformis patients to eliminate iodine completely from their diet, merely to avoid foods high in iodine as described above. Dr. Zone also explained that dermatitis herpetiformis patients need not avoid iodine indefinitely. Iodine is an important mineral for our bodies. dermatitis herpetiformis patients can stop avoiding iodine when their rash symptoms clear up which can take anywhere from a few months to a couple of years on a gluten-free diet. "

My approach would be, after the challenge is over and you've given your gut a month or two to heal, to slowly start reintroducing small quantities of iodine-containing foods and find your own tolerance level (which will likely increase over time as you heal from the damage). Again, iodine is an absolutely essential nutrient, and shellfish and sea fish are very healthy foods that shouldn't be removed from the diet unless they cause more problems than they solve.

I wish you the best on your journey!

JS

PS: If it were up to me, I would tell my partner to suck it up. Gluten grains aren't healthy for anyone -- and you shouldn't have to suffer in order to "prove" to anyone that they need to understand and accommodate a healthy dietary choice. That's my opinion: take it as you will.