Clinical Review / Peer Reviewed

The Evidence for Herbal and Botanical Remedies, Part 2

Clinician Reviews. 2018 June;28(6)

Herbals (1 of 2)

References

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52. Baba S, Natsume M, Yasuda A, et al. Plasma LDL and HDL cholesterol and oxidized LDL concentrations are altered in normo- and hypercholesterolemic humans after intake of different levels of cocoa powder. J Nutr. 2007;137:1436-1441.
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Diabetes. Chocolate may exert significant vascular protection because of its antioxidant properties and possible increase of nitric oxide bioavailability, which can influence glucose uptake. A small trial comparing the effects of either dark or white chocolate bars (which do not contain the polyphenols) showed improved BP and glucose and insulin responses to an oral glucose tolerance test in healthy subjects on dark chocolate, but not white chocolate. ⁶⁸ A comparison of chocolate consumption and risk of diabetes in the Physicians’ Health Study showed an inverse relationship between chocolate intake with incident disease, but this association appeared only to apply in younger and normal-body weight men after controlling for comprehensive lifestyles, including total energy consumption. ⁶⁹

Fatigue. The effect of chocolate on a person’s energy level has been noted for centuries. ⁷⁰ A small randomized trial showed improved energy levels in those treated with higher chocolate intakes. In a double-blind, randomized, clinical pilot crossover study, high cocoa liquor/polyphenol rich chocolate, reduced fatigue in subjects with chronic fatigue syndrome. ⁷¹

Anxiety. A small randomized trial showed chocolate decreased anxiety in high-anxiety trait subjects and improved the anxiety level and the energy levels of low-anxiety trait participants. ⁷²

Eye effects . The literature presents conflicting evidence regarding the effect of flavonoids on patients with glaucoma and ocular hypertension. However, a meta-analysis showed that flavonoids have a promising role in improving visual function in patients with glaucoma and ocular hypertension, and appear to play a part in both improving and slowing the progression of visual field loss. ⁷³

Cognitive decline . Chocolate intake (any type) was associated with a lower risk of cognitive decline (RR = 0.59; 95% CI, 0.38-0.92) with the greatest benefit noted in those who averaged more than one chocolate bar or one tablespoon of cocoa powder per week. This protective effect was observed only among subjects with an average daily consumption of caffeine <75 mg (69% of the participants; RR = 0.50; 95% CI, 0.31-0.82). ⁷⁴

The bottom line

Chocolate with high cocoa content (dark chocolate) appears to be safe and beneficial as part of a healthy diet and lifestyle that includes exercise and stress reduction to decrease cardiovascular risk and may improve energy levels.

CORRESPONDENCE
Michael Malone, MD, Family and Community Medicine, Penn State College of Medicine, 500 University Drive, Hershey, PA 17033; malm0001@hotmail.com.

The Evidence for Herbal and Botanical Remedies, Part 2

Herbals (1 of 2)

References

The bottom line

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Herbals (1 of 2)