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Sunday, April 08, 2012
Antioxidants in saffron fight depression, dementia and PMS
From The Clinical Advisor:
Most of us know saffron as that wonderfully, intense (and expensive) spice used to make risotto, pilaf and paella. Saffron is extracted from the dried stigma of the crocus flower (Crocus sativus). The saffron crocus is a sterile plant, as it cannot independently pollinate and reproduce. The plant is extremely difficult to cultivate, which is part of what makes the spice so expensive. Each crocus stalk grows 8 to 10 inches in height and produces up to four individual purple flowers. The flower has only three stigmas that yield the crimson powder that we know as saffron.
Harvesting these stigmas is a very labor intensive effort, and it is estimated that 225,000 stigmas or 75,000 blossoms are needed to produce a single pound of saffron spice.
Saffron's use as a spice, dye and medicinal plant dates back to ancient Greece and southwestern Asia. Pictorial records produced 50,000 years ago, show colorful depictions of burnt-orange saffron strands being harvested from rich purple plants.
And a seventh-century Assyrian ruler compiled a botanical reference list for saffron in which he cited more than 90 illnesses that saffron was used to treat in classical times. Today, Iran produces over 90% of the world's supply of the spice.
As a spice, saffron is known not only for its intense, yellow-orange coloration, but hay-like, sweet taste. Saffron, unbeknown to most, contains more than 50% of the USDA's recommended daily allowance of vitamin C, iron, and magnesium, and more than 30 % of the recommended daily phosphorus and potassium.
Saffron's standardized strength-of-evidence ratings are strongest for depression, Alzheimer's disease and premenstrual syndrome (PMS). The active ingredient in saffron that is believed to be responsible for health benefits is crocetin, a potent antioxidant and carotenoid. This compound has chameleon-like properties in that it acts different ways to meet the needs of differing conditions.
In Alzheimer's disease, crocetin appears to inhibit beta-amyloid (Abeta) protein fibrillogenesis, a hallmark of Alzheimer's destructive pathology. In inflammatory conditions, crocetin down-regulates the production and modifies the expression of pro-inflammatory cytokines and inducible nitric oxide-synthase levels. Crocetin also demonstrates possible antinociceptive activity.
In a clinical trial comparing saffron to placebo in patients with mild-to-moderate depression, the saffron group out-performed the placebo group. The results, based on pre-and post-study scores on the Hamilton Depression Rating Scale, yielded a statistically significant level (P<0.001). Another study examined 40 adults with DSM-IV criteria, suggesting a major depressive episode. Patients were randomly assigned to receive either saffron or fluoxetine (Prozac) for an eight-week treatment period. At the end of the trial, both groups exhibited similar results, with each group demonstrating a symptom remission rate of 25% for both treatments.
In Alzheimer's disease, researchers have shown that the continuous cognitive decline is due, at least in part, to the abnormal deposition of Abeta protein in the brain cells. Research suggests that saffron may inhibit Abeta deposition. In a study of 46 patients diagnosed with mild-to-moderate Alzheimer's disease, randomized treatment with saffron or placebo was given for a 16-week period. At the end of the trial, participants receiving saffron treatment showed significant improvement over baseline testing on standardized cognitive tasks.
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