Will I be malnourished on a fast day?

As long as you are eating nutritious food this will not be a concern, however, you may want to consider taking multivitamins if in doubt. If you are worried about not getting the recommended intakes of vitamins or minerals while doing intermittent fasting, we would strongly suggest taking a multivitamin/mineral supplement on both fast days and non-fast days. Keep in mind that vitamins and minerals are calorie-free, so they will not count towards your calorie allowance on fast day. Please only take the recommended dosage indicated on the bottle, and only take iron supplements if recommended by your doctor.