Health Concerns For BELIEVERS
Medical Aspect of Islamic Fasting
written by:Shahid Athar , M. D.
There are over I billion Muslims in the world, including about 8 million in
North America. The majority of them observe total fasting (no food or water)
between dawn and sunset during the month of Ramadan. They do so not to lose
weight or for any medical benefit, but because it is ordained in the Quran
which says, "O you who believe! Fasting is prescribed to you, as it was
prescribed for those before you (i.e. Jews and Christians) so that you may
(learn) self-restraine" (2:183).
According to Islamic Law, children below twelve, sick patients, travelers
and women who are menstruating or nursing a baby are exempt from fasting. In
addition to staying away from food or water for the whole day, they are
asked to stay away from sex, smoking or misconduct during the time of the
fast. In addition, they are encouraged to do more acts of piety: prayer,
charity, or reading the Quran during this month.
Food is needed by the body to provide energy for immediate use. This is done
by burning up carbohydrates, that is, sugar. Excess of carbohydrates which
cannot be used are stored up as fat tissue in the muscles and as glycogen in
the liver for future use. Insulin, a hormone from the pancreas, lowers blood
sugar and diverts it to other forms of energy storage, that is, glycogen. To
be effective, insulin has to be bound to binding sites called receptors.
Obese people lack receptors. Therefore, they cannot utilize their insulin.
This may lead to glucose intolerance.
When one fasts (or decreases carbohydrate intake drastically), it lowers
one's blood glucose and insulin level. This causes a breakdown of glycogen
from the liver to provide glucose for energy needs and break-down of fat
from adipose tissue to provide for energy needs. On the basis of human
physiology described above, semi-starvation (ketogenic diets) have been
devised for effective weight control. These diets provide a calculated
amount of protein in divided doses with plenty of water, multivitamins, etc.
These effectively lower weight and blood sugar, but because of their side
effects, should be used only under the supervision of physicians.
Total fasting reduces or eliminates hunger and causes rapid weight loss. In
1975, Allan Cott in his Fasting as a Way of Life, noted, "Fasting brings a
wholesome physiological rest for the digestive tract and central nervous
system and normalizes metabolism." It must be pointed out, however, that
there are also many adverse effects of total fasting. That includes
hypokalemia and cardiac arrhythmia associated with low calorie starvation
diets used in unsupervised programs.
STUDIES ON ISLAMIC FASTING
Dr. Soliman from University Hospital, Amman, Jordan has reported that during
the month of Ramadan 1404 AH (June-July, 1984 AD) healthy Muslim
volunteers@2 males and 26 females ranging in age from 15-64 and 16-28 years
respectively-were studied. They were weighed and their blood levels of
cortisol, testosterone, Na, K, urea, glucose, total cholesterol, high
density lipoprotein (HDL), low density lipoprotein (LDL), triglycerides (TG)
and serum osmolality were measured at the beginning and at the end of
Ramadan. There was significant loss of weight in males from a mean of 73.8
6.2 kg to 72.0 7.1 kg (P less than 0.01) and in females from 55.2 4.8 to
54.6 4.2 kg (P less than 0.05). Blood glucose levels rose in males from 77.7
23.6 mg/dl to 90.2 ?.2 mg/dl (P less than 0.05) and in females from 76.0 7.6
mg/dl to 84.5 11.1 mg/di (P less than 0.002). All other parameters did not
show significant changes.
Dr. F. Azizi and his associates from the University of Medical Sciences,
Tehran, Iran has reported the following. Serum levels of glucose, bilirubin,
calcium, phosphorus, protein, albumin, FSH, LH, testosterone, prolactin,
TSH, T4, T3, and T3 uptake, as well as prolactin and TSH responses to TRH
were evaluated in a group of nine healthy men before and on the 10th, 20th,
and 29th days of Ramadan. Mean body weight decreased from 65.4 9.1 to 61.6
9.0 kg at 29th day. Serum glucose decreased from 82 4 mg/dl on the 10th day,
and increased thereafter (76 3 and 84 5 on the 20th and 29th days of fasting
respectively). Serum bilirubin increased from 0.56 0.17 to 1 43 .52 mg/dl on
the 10th day, and decreased thereafter (I. I. 0.4 on the 20th and 29th
days). All changes returned to basal values four weeks after fasting. There
were no significant changes in serum levels of Ca, P. protein, albumin, and
any of the measured hormones. Prolactin and TSH responses to TPH were also
unaltered. He concluded that 1) intermittent abstinence from food and drink
for 17 hours a day for 29 days does not alter male reproductive hormones,
hypothalamic-pituitary- thyroid axis or peripheral metabolism of thyroid
hormones and 2) physicians caring for Muslims should be aware of changes of
glucose and bilirubin during Ramadan.
Therefore it is concluded from the above two studies that the pre- scribed
fast does not cause any adverse medical effect and on the contrary, may have
some beneficial effect on weight and lipid metabolism.
WHY ISLAMIC FASTING IS DIFFERENT FROM ORHER TYPES OF FASTING
The prescribed fast of Muslims is different from the so-called "Diet Plans"
because it has beneficial features of both plans. Its unique medical
benefits are due to the following factors:
1. As compared to other diet plans, fasting in Ramadan does not cause
malnutrition or inadequate calorie intake since there is no restriction on
the type or amount of food intake before beginning the fast or upon ending
the fast at sunset. This was confirmed by M.M. Hussaini in 1974, when he
conducted dietary analysis of Muslim students at the University of North
Dakota, State University at Fargo during Ramadan. He concluded that calorie
intake of Muslim students during fasting was at two-thirds of NCR-RDA.
2. Fasting in Ramadan is voluntarily undertaken. It is not a prescribed
imposition from a physician. In the hypothalamus part of the brain there is
a center called "lipostat" which controls the body mass. When severe and
rapid weight loss is achieved by starvation diet, the center does not
recognize this as normal and, therefore, reprograms itself to cause weight
gain rapidly once the person goes off the starvation diet. So the only
effective way of losing weight is slow, self-controlled, and gradual weight
loss which can be achieved by modifying our behavior and changing our
attitude about eating especially by eliminating excess food. Ramadan is a
month of self-regulation and self-training in terms of food intake thereby
causing hopefully, a permanent change in lipostat reading.
3. With the prescribed fast, Muslims are not subjected to a diet of
selective food only (i.e. protein only, fruits only etc.). An early
breakfast, before dawn is taken and then at sunset the fast is broken with
something sweet i.e. dates, fruits, juices to offset any hypoglycemia
followed by a regular dinner later on.
4. Additional prayers are prescribed after dinner which help metabolize the
food. Using a calorie counter, I counted the amount of calories burnt during
the special night prayer of Ramadan (tarawih). It amounted to 200 calories.
This form of prayer as well as the five daily prescribed prayers use all the
muscles and joints and can be considered a mild form of exercise in terms of
5. Ramadan fasting is actually an exercise in self discipline. For those who
are chain smokers or who nibble food constantly, or drink coffee every hour,
it is a good way to break the habit.
6. The psychological effect of Ramadan fasting are also well observed by the
description of people who fast. They describe a feeling of inner peace and
tranquility. The prophet advised those fasting, "If one slanders you or
aggresses against you, tell him 'I am fasting."' Thus personal hostility
during the month is minimal. The crime rate in Muslim countries falls during
It is my experience that within the first few days of Ramadan, I begin to
feel better even before losing a single pound. I work more and pray more. My
physical stamina and mental alertness improve. As I have my own lab in the
office, I usually check my chemistry, that is, blood glucose, cholesterol,
and triglyceride before the commencement of Ramadan and at its end. I note
marked improvement at the end. As I am not overweight, thank God, weight
loss is minimal. The few pounds I lose, I regain soon after. Fasting in
Ramadan will be a great blessing for the overweight whether with or without
mild diabetes (Type 11). It benefits those also who are given to smoking or
nibbling. They can rid themselves of these addictions in this month.
FASTING FOR MEDICAL PATIENTS: SUGGESTED GUIDELINES
As mentioned earlier, the sick are exempt from fasting. But some, for
whatever reasons, do decide to observe fasting. For physicians treating
Muslim patients, the following guidelines are suggested.
Diabetic Patients: Diabetics who are controlled by diet alone can fast and
hopefully, with weight reduction, their diabetes may even be cured or at
least improved. Diabetics who are taking oral hypoglycemia agents like
Orinase along with the diet should exercise extreme caution if they decide
to fast. They should reduce their dose to one-third and take the drug not in
the morning, but in the evening at the time of ending the fast. If they
develop low blood sugar symptoms in the daytime, they should end the fast
immediately. Diabetics taking insulin should not fast. If they do, at their
own risk, they should do so under close supervision and make drastic changes
in the insulin dose. For example, they should eliminate regular insulin
altogether and take only NPH in divided doses after ending the fast or
before the pre-fast breakfast. Diabetics, if they fast, should still take a
diabetic diet during the pre-dawn meal, the ending of the fast meal, and
dinner. The sweet snacks common in Ramadan are not good for their disease.
They should check their blood sugar before breakfast and after ending their
Hypertensive or Cardiac Patients: Those who have mild to moderate high blood
pressure along with being overweight should be encouraged to fast, since
fasting may help to lower their blood pressure. They should see their
physician to adjust medication. For example, the dose of water pill
(diuretic) should be reduced to avoid dehydration, and long acting agents
like Inderal LA or Tenormin can be given once a day before the pre-dawn
meal. Those with severe hypertension or heart diseases should not fast at
Migraine Headache: Even in tension headache, dehydration or low blood sugar
will aggravate the symptoms, but in migraine during fasting, there is an
increase in blood free fatty acids which will directly affect the severity
or precipitation of migraine through release of catecholamine. Patients with
migraines are advised not to fast.
Pregnant Women (normal pregnancy): This is not an easy situation. Pregnancy
is not a medical illness. Therefore, the same exemption does not apply.
There is no mention of such exemption in the Quran. However, the Prophet
said that pregnant and nursing women do not have to fast. This is in line
with God not wanting anyone, even a small fetus, to suffer. There is no way
of knowing the damage to the unborn child until delivery, and that might be
too late. In my humble opinion, during the first and third trimester (three
months) women should not fast. If however, Ramadan happens to come during
the second trimester (4th-6th months) of pregnancy, a women may elect to
fast provided that 1) her own health is good, and 2) it is done with the
pen-nission of her obstetrician and under close supervision. The possible
damage to the fetus may not be from malnutrition provided the Iftaar and
Sahoor are adequate, but from dehydration, from prolonged (10-14 hours)
abstinence of water. Therefore it is recommended that Muslim patients, if
they do fast, do so under medical supervision.
- Athar, S. "Fasting For Medical Patients-Suggested Guidelines," Islamic
Horizon, May 1985.
- Athar, S. "Therapeutic Benefits Of Ramadan Fasting," Islamic Horizon, May
- Azizi F. et all, "Evaluation Of Certain Hormones And Blood Constituents
During Islamic Fasting Month," Journal qf the Islamic Medical Association,
- Bistrian, B. R. "Semi-starvation Diet, Recent Development" Diabetic Care,
- Blackburn, G. L. et all, "Metabolic Changes On PSMF Diet," Diabetes, June
- Cott, A. Fasting Is A Way Of Life, New York: Bantam Books, 1977.
- Hirsch, Jules. "Hypothalmic Control Of Appetite," Hospital Practices,
- Hussaini, N. M. Journal of Islamic Medical Association, October 1982.
- Khurane, R. C. "Modified Ketogenic Diet For Obesity," Cancer Monthly
Digest, July 1973.
- Soliman, N. "Effects Of Fasting During Ramadan," Journal of the Islamic
Medical Association, November 1987.