Insights & Discussion
Carrot's bioactive compounds can regulate immune response, reduce oxidative stress, and prevent damaging oxidative destruction, making it a potential preventive tool for various diseases.
In this literature review, mechanisms were proposed for how the antioxidant properties of carrot’s β-carotene and other bioactive compounds, such as phenolic acid, flavonoid, polyacetylene, and ascorbic acid could modulate the immune system. These proposals were centered around three main paths: anti-inflammatory response modulation, antioxidant response modulation, and overall immune response modulation (which involves both innate and adaptive responses).
In the discussion of results, it was revealed that the bioactive compounds in carrots have the ability to regulate pro-inflammatory and anti-inflammatory cytokines, and are also capable of reducing oxidative stress. This was shown by the decrease in the accumulation of reactive oxygen species and an increase in antioxidant capacity, which collaboratively helps to minimize destructive oxidative destruction. Additionally, these compounds influenced immune components, specifically via the regulation of leukocytes, antigens, immunoglobulins, and histamine levels. As a result, carrots were defined as a functional food source capable of immune modulation and potential prevention and treatment for a range of diseases.
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Carrot consumption, beyond its β- and α-carotene content, significantly reduces cancer risk, highlighting polyacetylenes as potential anti-cancer agents, urging active promotion of carrot intake.
2023 SSRN Electronic Journal Carrot Intake is Consistently Negatively Associated with Cancer Incidence: A Systematic Review and Meta-Analysis of Prospective Observational Studies Ojobor CC, O'Brien GM, Siervo M, Ogbonnaya C, Brandt K
Systematic Review Carotene Carrot
The study conducted a comprehensive search across various databases for studies published until June 9, 2022, exploring the relationship between carrot intake, α-carotene intake, α-carotene plasma concentration, and cancer incidence. Involving 198 observational studies, the systematic review identified 50 prospective studies (52,000 cases) linking carrot intake (directly or as α-carotene) to a substantial reduction in cancer risk (RR 0.90, 95% CI 0.87–0.94, P < 0.0001). Additionally, 30 prospective studies (91,331 cases) examining plasma α-carotene levels revealed a similarly significant risk reduction (RR 0.80, 95% CI 0.72–0.89, P < 0.0001), with moderate inter-study heterogeneity (I2 = 36% and 26%) and nonsignificant interaction with cancer types.
The findings emphasize the robust association between carrot consumption and decreased cancer risk, urging active encouragement of carrot intake. While α-carotene was used as a marker, the study suggests the need for further investigations into non-carotene-focused hypotheses to understand the underlying mechanisms of this association.
Carrot and carotene consumption could diminish the risk of a wide range of negative health consequences, including multiple types of cancer.
2023 Journal of the Science of Food and Agriculture Carrot and carotene and multiple health outcomes: an umbrella review of the evidence Yi X, Li J, Liao D, Peng G, Zheng X, Xu H, et al.
Review Article Alzheimer's Disease Anticancer Breast Cancer
An umbrella review methodology was adopted to identify connections between carrot and carotene intake and various health outcomes. We turned to databases such as Web of Science, PubMed, and Embase to find the needed data. The analysis included the collected evidence from both interventional and observational studies that focused on carrots, carotene, and any related health impact. To estimate the summary effect size for each correlation, both random and fixed effects models were employed.
The study reviewed a total of 1329 studies and utilized the data from 30 meta-analyses with 26 health outcomes that fit the eligibility requirements. These featured outcomes related to various types of cancer, fractures, age-related cataract, sunburn, and Alzheimer's disease. The associations were analyzed between the health outcomes and the intake of carrots, intake of carotene, and serum carotene levels.
Moderate consumption of carrots is associated with a lower incidence of colorectal cancer, implying a potential cancer prevention effect in a certain dose-range.
2022 Frontiers in Nutrition Association of Dietary Carrot/Carotene Intakes With Colorectal Cancer Incidence and Mortality in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial Jiang Z, Chen H, Li M, Wang W, Fan C, Long F
Cohort Study Carotene Carrot Colorectal Cancer
The research analysed the dietary intake of carrots/carotene and their relationship to colorectal cancer incidence and mortality in a cohort from the Prostate, Lung, Colorectal, and Ovarian Cancer Screening. The study involved 101,680 participants who joined the cohort between November 1993 and July 2001. The hazard ratios were estimated through multivariable Cox regression analyses. Additionally, subgroup analyses and interaction tests were conducted to check for potential effect modifiers. A generalised additive model was used to examine the non-linear trend of the exposure to cancer-related outcomes.
In total, the study documented 1,100 colorectal cancer cases and 443 cancer-related deaths. It was discovered that dietary carrot intake was linked to a 21% lower risk of colorectal cancer incidence for those in the 4th quintile group compared to the lowest quintile group. Increase in carrot intakes, on a per standard deviation, did not reveal any statistically significant associations with the disease incidence. There were no significant associations found between dietary α-, and β-carotene intake and colorectal cancer incidence, nor were there any associations between carrot/carotene intakes and cancer mortality. They also observed no non-linear dose-response relationships between dietary carrot, α-, and β-carotene intake and colorectal cancer incidence and mortality. Notably, the study found that smoking status could potentially modify the association of dietary carrot intake with incidence of colorectal cancer, but not mortality.
Recent phytochemical studies of jujube fruits have shed some light on their biological effects, such as the anticancer, anti-inflammatory, antiobesity, immunostimulating, antioxidant, hepatoprotective, and gastrointestinal protective activities and inhibition of foam cell formation in macrophages.
2013 Journal of Agricultural and Food Chemistry The jujube (Ziziphus jujuba Mill.) fruit: a review of current knowledge of fruit composition and health benefits Gao QH, Wu CS, Wang M.
Review Article Anti-Inflammatory Anticancer Digestive Health
The nutritional jujube (Ziziphus jujube Mill.) fruit belonging to the Rhamnaceous family grows mostly in Europe, southern and eastern Asia, and Australia, especially the inland region of northern China. Jujube has a long history of usage as a fruit and remedy. The main biologically active components are vitamin C, phenolics, flavonoids, triterpenic acids, and polysaccharides. Recent phytochemical studies of jujube fruits have shed some light on their biological effects, such as the anticancer, anti-inflammatory, antiobesity, immunostimulating, antioxidant, hepatoprotective, and gastrointestinal protective activities and inhibition of foam cell formation in macrophages. A stronger focus on clinical studies and phytochemical definition of jujube fruits will be essential for future research efforts. This review may be useful for predicting other medicinal uses and potential drug or food interactions and may be beneficial for people living where the jujube fruits are prevalent and health care resources are scarce.
Curcumin, a component of Indian spice turmeric, presents a potential natural treatment for depression, influencing neurotransmitters and protecting against several biological systems compromised in depression.
2012 Journal of Psychopharmacology Multiple antidepressant potential modes of action of curcumin: a review of its anti-inflammatory, monoaminergic, antioxidant, immune-modulating and neuroprotective effects Lopresti AL, Hood SD, Drummond PD
Review Article Anti-Inflammatory Immunomodulation Neuroprotective
The research methodology involved an extensive review of the varying influences and effects of curcumin on systems implicated in depression. These included neurotransmitter systems like serotonin and dopamine which are critical to mood regulation. The study also explored the effects of curcumin on hypothalamus-pituitary-adrenal disturbances, famously associated with stress response and mood disorders.
In terms of results, curcumin demonstrated promising potential as an antidepressant in animal models of depression. Additionally, it was found to help moderate damage to neurological systems and intestinal permeability, both of which are often compromised in major depressive disorders. It also exhibited properties that could help lower inflammation and protect against oxidative stress and mitochondrial damage. Together, these findings position curcumin as a promising natural treatment for depression.
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