Insights & Discussion
Daily goji berry supplementation increases antioxidant levels and protects visual health in the elderly, though the exact mechanism remains unclear.
In a double-masked, randomized, placebo-controlled study, elderly participants were given either a milk-based goji berry supplement (13.7 g/d) or a placebo for a 90-day period. Eye health was assessed via direct examination to measure pigmentation and soft drusen count in the macula, and blood tests were done to determine plasma zeaxanthin level and total antioxidant capacity.
In the discussion of results, the placebo group showed signs of hypopigmentation and soft drusen accumulation in the macula, which did not occur in the group that received the goji berry supplement. The group supplementing with goji berries also showed a significant increase in plasma zeaxanthin levels and total antioxidant capacity, while no change was seen in the placebo group. There were no adverse effects of the supplement reported in either group.
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Berries, largely due to their phenolic compounds, enhance internal antioxidant status and positively influence gut microbiota composition, promoting beneficial bacteria and suppressing harmful types.
2022 Antioxidants Evaluation of Antioxidant Capacity and Gut Microbiota Modulatory Effects of Different Kinds of Berries Chen J, Shu Y, Chen Y, Ge Z, Zhang C, Cao J, et al.
Experimental Study Antioxidant Blackberry Goji Berry
The study compared the antioxidant capacities and gut microbiota modulatory effects of nine popular berries: blackberry, black goji berry, blueberry, mulberry, red Chinese bayberry, raspberry, red goji berry, strawberry, and white Chinese bayberry. The anthocyanin profiles of each berry were identified using Ultra-performance liquid chromatography (UPLC) coupled with Triple TOF/MS. The antioxidant capacities were evaluated through four chemical assays (DPPH, ABTS, FRAP, and ORAC). Healthy mice were treated with different berry extracts for two weeks as a means of investigating in vivo antioxidant capacity and gut microbiota modulatory effects.
In terms of the results, it was observed that majority of the berries improved the internal antioxidant status, indicated by elevated serum or colonic Total Antioxidant Capacity (T-AOC), Glutathione (GSH), Total Superoxide Dismutase (T-SOD), Catalase (CAT), and Glutathione Peroxidase (GSH-PX) levels, along with a decrease in Malondialdehyde (MDA) content. All berries studied notably altered the gut microbiota composition, with most leading to the enrichment of beneficial Short Chain Fatty Acids (SCFAs)-producing bacteria and the curbing of potentially harmful bacterial types.
A botanical formula of lutein ester, zeaxanthin, and extracts from blackcurrant, chrysanthemum, and goji berry can effectively lessen eye fatigue and improve macular function.
2020 The American Journal of Clinical Nutrition A novel botanical formula improves eye fatigue and dry eye: a randomized, double-blind, placebo-controlled study Kan J, Wang M, Liu Y, Liu H, Chen L, Zhang X, et al.
Randomised Controlled Trial Blackcurrant Chrysanthemum Dry Eye
Research methodology involved the distribution of 360 randomly selected participants into four groups where they received placebos and three varied doses of a botanical formula. This formula, given in chewable tablets comprised of 6 mg, 10 mg, or 14 mg of lutein. Each participant was administered these once daily over a period of 90 days, and had three check-ins at the beginning, at day 45, and finally on day 90 of the study.
The results of the study indicated that the botanical formula effectively improved the individual scores of participants on eye fatigue symptoms like eye soreness, blurred vision, dry eyes, foreign body sensation, and tearing. Using the formula resulted in a notable decrease in the total score of eye fatigue symptoms at both the 45-day and 90-day intervals as compared to the placebo while also significantly improving visuognosis persistence time. Tear secretion improvement was observed in the groups having 10mg and 14mg lutein formula, supported by the Schirmer test. Furthermore, the results showed an increase in macular pigment optical density with all three doses of the formula, but no significant alterations were observed in the retinal thickness and retinal volume among all the groups at both check-ins.
Goji berry supplementation can improve macular pigment and visual acuity in patients with early age-related macular degeneration by increasing serum zeaxanthin levels.
2018 International Journal of Ophthalmology Macular pigment and serum zeaxanthin levels with Goji berry supplement in early age-related macular degeneration Shang Li, Na Liu, Li Lin, et al.
Randomised Controlled Trial Age-Related Macular Degeneration Goji Berry Zeaxanthin
In this prospective, randomized controlled study, 114 patients, aged 51 to 92 and with early age-related macular degeneration, were divided into two groups. One group was given a daily supplementation of 25 grams of Goji berries for 90 days while the control group continued with their normal diet. The study used Heterochromatic Flicker Photometry to measure the Macular Pigment Optical Density (MPOD) and High-Performance Liquid Chromatography to analyze the levels of serum lutein and zeaxanthin. These were recorded at the beginning and at the end of the study.
In the Goji berry group, by the end of the study, there was no significant change in serum lutein levels. However, there was an increase in serum zeaxanthin levels which coincided with the group's improvement in MPOD. In comparison to the control group, the Goji group had higher zeaxanthin levels and MPOD. The visual acuity of the Goji berry group also showed a relative decrease compared to the baseline. These results suggest Goji berry supplementation can beneficially impact early age-related macular degeneration patients by boosting serum zeaxanthin levels, thus raising MPOD and improving visual acuity.
Goji berry was identified as a rich source of antioxidant compounds, with health-promoting properties comparable with other common fruit species.
2015 Journal of Functional Foods Goji berry fruit (Lycium spp.): antioxidant compound fingerprint and bioactivity evaluation D. Donno, G.L. Beccaro, M.G. Mellano, A.K. Cerutti, G. Bounous
Systematic Review Antioxidant Goji Berry
A number of things lead to the confusion between the different species and genotypes of cultivated Lycium. In this study, wolfberry was identified as a rich source of antioxidant compounds; the observed analytical fingerprint demonstrated that the species represents a rich source of organic acids and polyphenolic compounds, especially cinnamic acids and catechins; this research suggested that identified nutraceuticals might contribute to the total phytocomplex of these fruits. This study developed an important tool to assess goji chemical composition and bioactivity, using different chromatographic methods for comprehensive authentication and quality control of its fruits: well-designed clinical trials with phytochemically well-characterized extracts are required before the potential of goji as a medicinal plant or food can be definitively assessed. Goji berry fruit is devoid of toxicity but caution is advised with regard to possible drug interactions as well as with products of unknown or dubious origin; for this reason, the development of rigorous quality control protocols for goji products is urgently needed: this research showed that analytical fingerprinting could be an important tool to assess quality, chemical composition, and bioactivity of wolfberry fruits, helping to find new sources of natural health-promoting compounds.
The antioxidants present in goji berries have comparable health-promoting properties to those found in other common fruits.
2015 Journal of Functional Foods Goji berry fruit (Lycium spp.): antioxidant compound fingerprint and bioactivity evaluation D. Donno, G.L. Beccaro, M.G. Mellano, A.K. Cerutti, G. Bounous
Systematic Review Antioxidant Goji Berry
The researchers studied the quality traits of goji berries and the levels of potentially fruitful compounds. They employed high-performance liquid chromatography (HPLC) - a technique widely-used to identify and separate components in a mixture - to examine the health-promoting compounds in goji berries, comparing these to what's found in other common fruits.
The researchers found that goji berries are a rich source of antioxidant compounds. It was determined that their health-promoting properties are akin to those of other common fruits. The characteristic "fingerprint" obtained through this study could help improve our understanding of this fruit, which is increasingly being recognized as a functional food due to its antioxidant properties.
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