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The white diet is confusing. Especially with diabetes.

Ask two clinics what you can eat the days before a colonoscopy and you will not get the same list. One allows something the next one crosses out. That is a cause of real confusion, and it is not you misreading the form.

If you could chew it and swallow it without teeth, it is probably fine. Soft, no skins, no seeds.

  • Clinic sheets don't all agree. No Australian database tells you, in one number, whether a food is low residue. If you have diabetes, look the food up on glycemicindex.com, then check it against your own plan and your team. This is generic advice and does not override any specific instructions from your doctor or clinic.

What does this guide cover?

The 4 sections below, one line each.

  1. Clinic sheets don't all say the same thing. Low-residue and white-diet lists are written by different hospitals, in different years, for different scopes.
  2. Residue isn't a fibre gram. The Australian Food Composition Database reports total dietary fibre, not residue.
  3. Look the food up, then check your plan. If you have diabetes, check it against your own plan and your team.
  4. Use glycemicindex.com for the food, not the recipe. The food-by-food lookup is the University of Sydney GI database.

Why do clinic sheets disagree on the white diet?

Each clinic sheet sets its own rules, and they conflict. One PDF may allow a food that another bans.

Low-residue and white-diet lists are written by different hospitals, in different years, for different scopes. Vegetarian and vegan versions of those lists disagree with each other too. A food is not “banned everywhere” because one PDF says so, and it is not safe everywhere because another PDF allows it.

What follows is how we think about the confusion, and how to look a food up yourself. This is generic advice and does not override any specific instructions from your doctor or clinic.

The no-teeth line is a rule of thumb, not a substitute for your doctor or clinic. Soft, no skins, no seeds, nothing you have to chew hard.

Lemon ricotta hotcakes from The Colonoscopy Cookbook
Lemon ricotta hotcakes

Why is residue not the same as fibre?

A fibre number doesn't tell you whether a food is low residue.

There is no Australian database that will tell you, in one number, whether a food is low residue. The Australian Food Composition Database reports total dietary fibre. Residue is not that number. Skins, seeds, gristle, and how the food is cooked are not in a fibre gram.

These recipes are not GI scored

A white diet is often white bread, white rice, and other foods that are easy on the bowel and not always easy on blood glucose. We have not scored the twenty Sophie Hansen recipes for glycaemic index or glycaemic load. A homemade mixed dish is not one number on a database.

If you have diabetes, how do you look a food up and check your plan?

If you have diabetes, use the steps below, then check it against your own plan and your team. The cookbook does not replace that. Optional extras in the book are for whoever is not on the restricted diet.

Questions about the white diet

Can glycemicindex.com tell me whether a food suits my white diet and my diabetes?

Not on its own. glycemicindex.com is the University of Sydney GI database, and it gives GI values for individual tested foods, not recipes. Diabetes Australia explains what those numbers mean. No Australian database tells you, in one number, whether a food is low residue. If you have diabetes, look the food up, then check it against your own plan and your team.

  • glycemicindex.com/Gi-Search: food-by-food GI lookup
  • University of Sydney GI database: source of the tested GI values
  • Diabetes Australia: explains what GI numbers mean
Why isn't total dietary fibre enough to tell whether a food is low residue?

Because residue isn't that number. The Australian Food Composition Database reports total dietary fibre, but skins, seeds, gristle, and how the food is cooked aren't in a fibre gram. So there's no Australian database that will tell you, in one number, whether a food is low residue.

Does the way a food is cooked affect its residue, even if the fibre grams are low?

A fibre gram doesn't capture it. Skins, seeds, gristle, and how the food is cooked aren't in that number, so a low fibre number on its own doesn't tell you a food is low residue.

The section Why is residue not the same as fibre? above explains that residue includes more than fibre numbers capture.

  • Why is residue not the same as fibre?: residue includes skins, seeds, gristle, not just fibre grams
What does 'can chew without teeth' mean in the days before a colonoscopy?

If you could chew it and swallow it without teeth, it's probably fine. Think soft, no skins, no seeds, nothing you have to chew hard. The no-teeth line is a rule of thumb, not a substitute for your doctor or clinic.

Why do clinics disagree on what's allowed on a white diet before a colonoscopy?

Because low-residue and white-diet lists are written by different hospitals, in different years, for different scopes. Vegetarian and vegan versions disagree with each other too. A food isn't "banned everywhere" because one PDF says so, and it isn't safe everywhere because another PDF allows it. This is generic advice and does not override any specific instructions from your doctor or clinic.

  • Clinic sheets: written by different hospitals, in different years, for different scopes
  • Residue: not the same as a fibre gram
  • No-teeth line: a rule of thumb, not a substitute for your doctor or clinic
What is the white diet, and what foods does it typically include?

A white diet is often white bread, white rice, and other foods that are easy on the bowel and not always easy on blood glucose. Clinic sheets don't all describe it the same way. This is generic advice and does not override any specific instructions from your doctor or clinic.

Use glycemicindex.com for the food, not the recipe

The food-by-food lookup is the University of Sydney GI database.

  1. Open glycemicindex.com/Gi-Search.
  2. Search the food, not the whole recipe. “White bread” or the brand, not “Monday’s dinner”.
  3. Set the country to Australia if you are matching a local product.
  4. Prefer a tested Australian brand over a generic or overseas row. Read the manufacturer, the serving, the carbohydrate portion, the GI, and the year.

What those numbers mean is explained by Diabetes Australia. A food with little or no carbohydrate cannot have a GI.

A clear fluid, a broth, or a mixed homemade meal will often not appear as a single tested food. That is a missing row, not a zero.

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