tabhastal wrote:While one meal a day may be okay for people who are already healthy, it is a big mistake for people who are sensitive to levels of blood sugar such as diabetics and pre-diabetics. ...
Of course. And sometimes monks are advised by a doctor to eat in the evening, so they do. I knew one personally.
And remember that fluids such as tea or fruit juice and certain "tonics" are allowed (it varies, but the Ajahn Chah monks, for example, often have snacks of dark chocolate). So it's not as if one can't have some sugar.
Anyway, as has been pointed out, the common practise is two meals.