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 Breath Test Prep Diet Guideline

General Requirements and Sample Menu

Following the Breath Test Prep Diet Guideline is VERY important for accurate results.

If you (the patient) are not able to comply with these instructions, you may not be a candidate for a breath testing. In this case your health care professional can assist you in determining if another test without these preparation limits is more suitable for you.

The breath test prep diet requires a period of food restriction for 24-48 hours.

The diet preparation is the same for each breath test, regardless of the sugar being tested (e.g., glucose, lactulose, lactose or fructose).

If you have special dietary restrictions that prevent you from consuming foods from this list, please contact us.

Breath Test Prep Diet Guidelines

  • Wait at least FOUR WEEKS if you have had a colonoscopy, or colonoscopy prep, barium study or colonic therapy.
  • Wait at least TWO WEEKS if you recently had antibiotic therapy, enema or runny diarrhoea,
  • THREE DAYS before (or as instructed by your practitioner), STOP any probiotics or osmotic laxatives (ending in “-ol” or “-ose”) 
  • If you are prone to constipation, please follow the low-residue diet below for TWO days, rather than just one.
  • If you are uncertain if something will affect the test, AVOID the product or consult your physician prior to starting the test.

Before you start the breath test, a minimum 24-hour preparation is required. This consists of a 12-hour restricted diet and a 12-hour fasting period.

The first 12 hours is the restricted diet. Limit your food to those listed below.  

Typically, people decide what time they wish to start conducting the breath test and work backwards.  For example, if you plan to start collection at 8am, you will have nothing to eat after 8pm the night before.

You need to get up at least one hour prior to starting the breath test (whether you are doing the test at home or in-clinic), so this would be 7am for an 8am start. No food, exercise, vaping or smoking in this hour.



Food Restrictions for the Breath Test Prep Diet

During the breath test diet preparation period you may consume ONLY:

  • Chicken, turkey, fish, lean beef or lamb. Avoid fatty cuts and avoid pork (including ham & bacon). Meat can be baked or broiled, or gently fried in a small amount of oil
  • Salt and pepper – no other seasonings are permitted
  • Plain steamed white rice (not Basmati rice. Short or long-grain white rice or jasmine rice is best). Please cook rice fresh for each meal – reheated rice becomes a resistant starch and can interfere with your test results.
  • White rice noodles
  • Plain rice crackers, such as Orgran Gluten Free Rice Crispbread
  • Eggs – cooked any way, without milk of any kind.
  • White bread only (or white rice bread – ensure it has no added starches or dairy products). All bread must be dairy free. A quality crusty sourdough is a fairly safe option.
  • Small amounts of hard cheese such as parmesan or pecorino for flavouring only.
  • Small amounts of butter, ghee or oil.
  • Weak black tea or coffee, or water. No sugar (stevia is OK)


DO NOT eat any of the allowed foods if you react to them or exclude them for other reasons. If you are vegetarian, you can have tofu for your protein.

If you feel this diet it not doable (e.g. vegetarian, vegan), please contact us 098465566 or 

The second 12 hours DO NOT eat or drink anything, except water.




Breakfast Options

  1. Eggs
    • Boiled, scrambled (no milk – add a little water) or fried in a little butter or oil (with salt and pepper)
    • Poached with a little Hollandaise sauce (homemade with egg yolk and butter only), served with salmon or other fish
    • Omelette made with water and a little canned salmon (canned in spring water and drained)
  2. French toast – white bread or white rice bread (see below) soaked in beaten eggs (NO MILK) and fried in a little butter or oil.
  3. Plain waffles or pancakes made with white flour, egg, water, baking powder & a little butter. (NO MILK or SUGAR)
  4. Homemade all-meat patty made with lean mincemeat, egg and white-breadcrumbs, salt & pepper.  Fried in a little butter or oil.
  5. Coffee, weak, black. 




Breath Test Prep Diet

French toast with white bread and eggs.
Use just a little butter or ghee to fry.

Lunch Ideas

  1. Piece of chicken (breast, thigh, etc). Roasted, broiled or sautéed in oil with salt and pepper with steamed white rice.
  2. Piece of white fish, dipped in white flour, a beaten egg and white breadcrumbs.  Fry gently in a little butter or oil, serve with plain white rice with butter, coconut oil or ghee.
  3. Cup of meat broth (made with just meat and water – no bones or cartilage) e.g.; clear chicken or beef broth (made with meat and marrow bones– not bone broth)

Dinner Options

  1. Lunch options (see above)
  2. Lean steak: grilled or fried in a little oil with salt and pepper
  3. Sautéed shrimp, calamari, or baked salmon with butter or oil
  4. Homemade all-meat patty made with mincemeat, egg and white-breadcrumbs(crushed Orgran rice wafers if gluten-free), salt & pepper. Fried in a small amount of butter or olive oil.
  5. Steamed white rice.


  1. Meat broth (as above)
  2. Hard-boiled egg topped with a little olive oil, salt and pepper
  3. Canned sardines or salmon or tuna (canned in springwater or olive oil, drained)
  4. Plain white crackers – made without lactose or milk products, such as:
    1. Arnotts or Graham’s water crackers.
    2. Orgran Gluten Free Rice Crispbread
  5. Slice of white bread or white rice bread with butter. See the recipe below. NOTE: soft-crusted breads may contain milk or milk powder. Please check. If in doubt, avoid. French sticks or crusty loaves are more likely to be made without milk.

SIBO Breath Test prep

Grilled chicken on white rice

Home-made Gluten-free bread (Breadmaker Recipe)

450 ml water
3 tbsp oil
3 eggs
1 tsp vinegar
3 ½ cups white rice flour
1 ½ tbsp guar or xanthan gum
3 tbsp raw sugar
1 ½ tsp salt
2 tsp active dried yeast

Mix liquid ingredients together in a bowl. (Do not use electric mixer, as this will aerate the mixture.)
Mix dry ingredients together in a large bowl.
Combine liquid and dry ingredients.
Mix to a soft dough ensuring all ingredients are well combined.
Spoon dough into bread-maker pan, pressing down with a spatula after each spoonful, to eliminate air bubbles.
Lock bread pan into baking chamber.
Use the setting: Basic bread + medium crust then press “start”.iet guideline for SIBO breath testing

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