|
|
Fasting
is a low-cost, effective therapy for a wide range of conditions,
including hypertension, headaches, allergies and arthritis. By relieving
the body of the task of digesting foods, fasting allows the system
to rid itself of toxins while facilitating healing.
Uses
Prolonged fasting
is an extremely effective-though not necessarily desirable-way to
lose weight in a hurry. Much depends on the type of fast you undertake.
Total fasts, which were popular in the 1960s, promote the loss not
only of body fat, but of muscle tissue and other body proteins as
well. The modified fasts developed more recently solve this problem
by allowing intake of protein. Total fasts also tend to produce
unpleasant-sometimes even dangerous-side-effects, another problem
that the modified, protein-sparing diet generally eliminates. Both
approaches, however, have one major drawback in common: whatever
weight you shed during the fast usually returns once it ends. While
the purpose of these long-term fasts is to help one shed unwanted
pounds, many advocates of naturopathic medicine recommend shorter
periods of therapeutic fasting to help alleviate diseases like arthritis,
irritable bowel syndrome, eczema, depression, asthma and psoriasis,
and to 'detoxify' the body from environmental poisons that have
built up over the years (see also the profile on detoxification
therapy). The value of this sort of fasting is much more dubious,
although short fasts followed by a carefully restricted vegetarian
diet have shown promise for relieving arthritis.
Procedure
of Treatment
Weight-loss
Fasts: Currently, two variations of the protein-sparing modified
fasts are used to assist in weight loss. Both are recommended only
for people who are dangerously overweight. They are not for those
who have gained a few pounds over the winter and are trying to get
back into shape for the beach. Version one calls for a daily intake
of 1.5 grams of protein per 2.2 pounds of your ideal body
weight. In practical terms, that means consuming about 75 grams
daily if you are a woman, or 100 if you are a man-roughly the daily
amount in the typical American diet. The protein should be high-quality
(meat, fish, or fowl), and should be supplemented with a multiple
vitamin tablet plus extra potassium and calcium. Version Two substitutes
a premixed formula rich in milk or egg protein for the meat and
vitamins used in version one. Such formulas usually provide about
50 to 70 grams of protein daily, 40 milligrams of carbohydrate,
and a little fat. Critics fault them for failing to include enough
protein, the requirement for which goes up as your calorie intake
goes down. They also point out that it is cheaper to buy the components
separately than in premixed form. Aside from these minor differences,
however, the two diets are much the same. Typically, a modified
fasting programme lasts for several months, furnishing no more than
600 calories a day-an amount much lower than that needed to maintain
weight. (A non-pregnant woman under age 50 usually needs between
1,600 and 2,500 calories. A man in the same age range needs 2,500
to 3,000.)
Detoxification
Fasts: Some proponents of detoxification recommend brief, intense,
water-only fasts. However, a three-day fast supplemented with vegetable
and fruit juices is more typical. The procedure often begins with
a 'pre-fast'. On the day before the fast starts, you are instructed
to eat lightly, finishing the day with a meal of fresh fruits and
vegetables. During the fast itself, you are expected to drink three
to four eight-ounce glasses of juice, preferably freshly squeezed.
Most therapists also recommend avoiding coffee and soft drinks,
and getting lots of rest. Often the entire procedure is scheduled
for a weekend, when you can conserve energy and take naps as needed.
It is also best to avoid vigorous exercise, although short walks
or stretching are considered acceptable. You will notice that, as
the fast progresses, your body temperature will fall and your blood
pressure, pulse and rate of breathing will slow down-all signs of
a decline in your metabolic rate. Since the drop in body temperature
may make you feel colder than those around you, be sure to wear
extra clothing to keep warm. During the first day of the fast, you
will lose three to five pounds. That is a water loss that will come
right back after you start eating again. To break the fast, experts
suggest that you introduce solid foods slowly in limited portions.
Benefits
Although
modified, protein-sparing fasts are considered a reasonably safe
way for the dangerously obese to quickly bring down their weight,
this approach is no longer favoured by most doctors due to the abrupt
rebound that almost invariably occurs when the patient resumes eating.
Instead, most physicians now recommend a gradual weight-loss programme
accompanied by a sustained effort to modify bad eating habits. Likewise,
few doctors believe that fasting, in itself, has any lasting therapeutic
effects. Indeed, extended fasts can be quite harmful. However, as
part of a larger dietary modification programme, some fasts have
delivered encouraging results. During an experiment reported in
the respected medical journal Lancet, Norwegian researchers
put 27 patients with rheumatoid arthritis on a 7 to 10 day partial
fast, followed by a special vegetarian diet free of refined sugar,
citrus fruit, milk products, eggs and gluten-the protein found in
many grains. The diet plan required participants in the study to
slowly reintroduce foods, one by one, every second day, and to watch
for the return of symptoms. If they reappeared within 48 hours,
the food was eliminated permanently. At the end of three to five
months, the participants were left on the resulting vegetarian diet.
Although the symptoms of arthritis often improve while a patient
is fasting, they usually return as soon as eating is resumed. In
the Lancet experiment, however, the patients enjoyed lasting
results. By the end of four weeks, patients on the experimental
diet had significantly fewer swollen, tender joints, less pain,
better grip strength and improved lab-test results. Those volunteers
who stayed off the regime did not fare nearly as well. Some researchers
attribute these results to the elimination of foods which, they
theorize, act as 'arthritic allergens', causing the immune system
to produce antibodies that attack the joints and produce symptoms.
Others speculate that a vegetarian diet may alter the bacterial
population in the large intestine, somehow relieving the disease.
The truth of the matter has yet to be established; but if you suffer
from arthritis, you might want to give the programme a try, regardless
of the explanation.
Who
Should Avoid This Therapy?
Prolonged,
modified fasts should be avoided by all but the seriously obese,
and should be undertaken only under supervision of a physician who
has plenty of experience and training in this kind of treatment.
Experts also advise that even with adequate supervision, a modified
fast should not extend beyond 16 weeks. Shorter fasts are safer,
of course, but for many people it is wise to avoid even a three-day
fast. Pregnant mothers, for instance, risk depriving their baby
of much-needed proteins, fats and other nutrients whenever they
fast. Similarly, nursing mothers compromise the quality of their
breast milk. Others who should avoid any sort of fast are those
with ulcers, diabetes or diseases of the liver, heart, kidney and
lungs, as well as anyone with advanced cancer. Children are not
very good candidates for even a one-day fast. In one study, children
who fasted from dinner time until noon the next day had poorer scores
on tests that measured memory and the ability to recognize various
types of visual stimuli. As you might expect, those who were already
undernourished did the worst. It is also wise to check with your
doctor before attempting even a one-day fast if you are taking any
prescription medications. Many drugs need to be taken with food
to improve their absorption, or minimize their harsh effects on
the stomach and intestinal tract. In other instances, the biochemical
changes that occur during fasting may alter the way the body handles
the drug.
Side-effects
In
the late 1970s, a popular 'liquid protein' diet product was linked
to a number of sudden deaths. The victims suffered fatal heart disturbances
typically brought on by protein and mineral deficiencies, and it
was discovered that the protein they were taking was actually collagen,
which is useless as a source of nutritional protein. The formulas
available today are, needless to say, much safer and rarely cause
any serious cardiac side-effects (although they are still best reserved
for those with severe weight problems and should always be taken
under a doctor's supervision). There are, however, other risks that
continue to accompany any stringent weight-loss regime. Potassium
deficiency, which can cause severe irregularities in the heart rhythm,
remains a threat. So does protein depletion. And the rapid burning
of fat that occurs when the body is deprived of carbohydrates can
lead to a build-up of byproducts called ketones, which, in
turn, can interfere with elimination of uric acid, triggering a
painful attack in those who suffer from gout. Any rapid weight-loss
programme-including fasting-also poses a risk of gallstones. In
addition, salt and water depletion can lead to light-headedness
and dizziness when first standing up. Other potential side-effects
include constipation, dry skin and menstrual irregularities. If
you are in good health and are doing a brief, one-to-three day fast,
it is not uncommon to experience some light-headedness, fatigue,
or a headache. If you have been a heavy coffee drinker, for instance,
and stop for three days, you will probably suffer a caffeine withdrawal
headache. On the plus side of the equation, many fasters report
mild euphoria or an increased sense of well-being and clearer thinking.
If you fast for only 24 hours, you may not experience the build-up
of ketones that accompanies a longer fast. That is because during
the first day, your body is busy buring the stored carbohydrates
referred to as glycogen. After that, as the body begins to
metabolize fat stores, you may notice that your breath takes on
a sweet or fruity aroma. That is produced by acetone, one of the
ketones produced when fat stores are burned. The symptom is harmless.
|