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What is worth writing in about

Corrections to food values, with a source

This is the most useful mail the site receives. If a teaspoon figure, glycaemic load or portion on the site does not match its published source, or if you know of a better source for a food, please send:

• the food and the figure shown on this site,
• the figure you believe is correct,
• the source: a link, or a full reference for a paper or table, with the page or table number if you have it.

Corrections with sources are checked against the source and, where they hold up, the data is changed and the change is recorded on the sources page. A correction without a source can still be useful, but it takes longer to verify.

Errors in the calculator

If the total looks wrong, a button does not respond, a shared link does not restore the right foods, or something displays badly on your device, please describe what you did and what you saw. The link from your browser's address bar, and the device and browser you were using, make it much easier to reproduce.

Questions about the method

Questions about glycaemic index, glycaemic load or the teaspoon conversion are welcome, particularly where the explanation on this site is unclear. Clearer explanations often start with a question that was not answered well.

What this address cannot help with

This site cannot give personal medical or dietary advice, and cannot comment on an individual's blood glucose readings, medication or diet. Please take those questions to a doctor, nurse, pharmacist or registered dietitian.

The site is independent of Dr David Unwin and the Public Health Collaboration, and cannot pass messages to them. Questions about the original infographics can be directed to the Public Health Collaboration through phcuk.org.

What happens to your email

Your message is read by a person. Your address is used only to reply, and is not added to any list or shared. See the privacy policy for more.