This (pdf) is a 2007 DH publication on fasting aimed at healthcare professionals. Standard caveats about non-CSIS documents (even those published by government departments) apply. Hat tip to Shanaz.

Selected extracts:

“The fasts of Ramadan can improve a person’s health, but – if the correct diet is not followed – can possibly worsen it!”

“Deep-fried foods,… high-sugar/high-fat foods”

Instead eat:
“Whole grains,… milk-based sweets and puddings”

“Many of the foods which are mentioned and encouraged in this booklet are in the Holy Qur’an, and the Sunnah (the Prophetic traditions) also correspond to modern guidelines on a healthy diet and will help to maintain balanced, healthy meals in Ramadan. The most commonly consumed foods by Prophet Mohammed (peace be upon him) were milk, dates, lamb/mutton and oats. Healthy foods mentioned in the Holy Qur’an are fruit and vegetables, such as olives, onions, cucumber, figs, dates, grapes as well as pulses such as lentils.”

Author: Communities in Action
Published date: 13 September 2007
Primary audience: Public, Health and social care professionals

This booklet is aimed at helping to understand the health issues related to fasting, to help people make more informed choices, minimise complications and maximise the benefit of the fast.

The booklet gives a guide through the physiological changes that occur during fasting, gives examples of beneficial and harmful foods during fasting, discusses potential medical problems and remedies, suggests a diet plan, and responds to the most frequently asked questions about fasting in general and medical issues in particular.

The booklet also contains a section for doctors and medical professionals, to enable them to provide more informed services.