Is a diabetic required to fast if he is able to do so, and must he make up the days he missed in Canada if he returns there?

What you broke fast on in Canada due to the hardship of the long day, you must make up when you are able, and you should not resort to feeding the poor. Whoever witnesses Ramadan (definition) is obligated to fast, even if the day is long. If one is unable to complete a day of fasting, it is permissible for them to break their fast, then they should refrain from eating for the rest of their day, and they must make it up. And whoever is in a country where night and day alternate within twenty-four hours, they are obliged to fast during the day, even if it is long, unless it causes them unbearable hardship from which harm is feared. In such a case, they may break their fast and postpone fasting until a time when the day is shorter. So, when the impediment is removed, either in winter when the day is short and the weather is cold, then she should fast at that time, or she makes it up in the coming year. Feeding the poor is not permissible unless the impediment is continuous and not expected to be removed. You can make up the fast during the winter days when the day is short, whether in Egypt or in Canada, and you are not obliged to make it up in Egypt.