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The purpose of this paper is to explore the sources of caffeine and its utilization in different food products, along with its impact on human health in terms of benefits and adverse effect.

The papers reviewed were selected based on the following key descriptors such as caffeine, sources, trends of consumption, utilization, benefits and adverse effects, regulation and labelling.

There are many physiological effects of caffeine on respiratory, cardiovascular, gastrointestinal, reproductive and central nervous system. It has a positive effect in reducing the risk of diabetes, Alzheimer’s disease, Parkinson’s disease and liver injury and, at the same time, in improving mood, psychomotor performance and immune response. On the other hand, the negative effects of caffeine include addiction, cancer, heart diseases, insomnia, gastrointestinal disturbances and intoxication. As caffeine, when taken in large amount, is harmful, therefore as per the regulatory bodies, its concentration should not exceed the set limit, and its presence needs to be listed on the label of that particular food product. In a nutshell, it can be said that caffeine acts as a boon as well as bane because it possesses both beneficial and adverse effects.

This is a unique and comprehensive review that will provide a brief overview of sources, utilization, healthful as well as harmful effect of caffeine to the readers.

The paper aims to describe the effects of caffeine intake on exercise performance as well on diabetes, cirrhosis and asthma.

The review includes the most updated studies found in Pub‐Med all of which are in relation to caffeine and exercise performance as well as its effects on disease issues.

The majority of studies show that caffeine ingestion of about 6 mg of body weight mass may have a positive effect on endurance and anaerobic exercise performance. In addition, if it is consumed together with carbohydrates, it may also improve post‐recovery glycogen synthesis. Intake of caffeine was also found to have a positive effect on the prevention of liver cirrhosis, reducing asthma attacks and lowering the risk of type 2 diabetes.

The paper gives information to nutritionists, clinical dietitians and sports nutritionists on the newest data about the effects of caffeine on exercise performance and disease issues.

The purpose of this paper is to explore the effects of low doses of caffeine (<3 mg/kg) on jumping performance using a meta-analysis.

The search for eligible studies was performed through six databases, with additional backward and forward citation tracking. A random-effects meta-analysis was performed to compare the effects of caffeine vs placebo on jump height. The methodological quality of the included studies was appraised using the physiotherapy evidence database checklist.

Eight studies were included in the review. They were classified as good or excellent methodological quality. The pooled number of participants across all studies was 203. Four studies provided caffeine in relative doses, ranging from 1 to 2 mg/kg. Four studies provided caffeine supplementation in absolute doses of 80, 150 or 200 mg. The meta-analysis found that caffeine ingestion increased vertical jump height (Cohen’s d: 0.21; 95% confidence interval: 0.10, 0.31; p < 0.001; +3.5%).

The present meta-analysis found that caffeine doses of ∼1 to 2 mg/kg enhance jumping height. The effects observed herein are similar to those with higher caffeine doses, which is relevant as low caffeine doses produce minimal side effects. For most individuals, a caffeine dose of ∼1 to 2 mg/kg is equivalent to an amount of caffeine in an energy drink, one to two cups of coffee, one to two pieces of caffeinated chewing gum or several cups of green tea.

The purpose of this review is to provide a comprehensive summary of current research on the health risks and benefits associated with coffee drinking.

This review includes up‐to‐date information from the original literature on coffee drinking and health and presents findings in a manner accessible to both experts and non‐experts.

Coffee contains caffeine, antioxidants, and other phytochemicals, all of which affect disease risks. There is evidence that coffee drinking may not be suitable for certain individuals. Overall, however, coffee drinking seems to be a non‐harmful habit for those who drink it regularly and in moderation, and recent studies indeed suggest that it may even be beneficial for most people. The most currently available evidence suggests that coffee drinking can help reduce the risk of several diseases, most notably type 2 diabetes, Alzheimer's disease, and Parkinson's disease, although the underlying mechanisms for this effect are still being investigated.

Current studies suggest that coffee drinkers can help protect themselves from neurodegenerative and other diseases by drinking an average of two cups of regular, filtered coffee per day.

This article provides accessible and comprehensive information to researchers, nutritionists, and consumers who are interested in the potential health risks and benefits of regular and moderate coffee drinking.

The aim of this paper is to determine lifestyle factors associated with different drink choices as past research has suggested some differences.

Caffeinated tea and coffee consuming habits in a South Wales sample were investigated by postal questionnaire. Multiple regression was used to determine odds ratios for demographic, health and lifestyle factors associated with drink patterns. There were 7,979 questionnaire respondents, 58 per cent of whom were female. Their mean age was 45.61 years (SD =18.00, range =16‐97).

Caffeinated tea/coffee consumption was associated with both alcohol and smoking behaviours. The results also suggested that non‐consumers of caffeinated tea or coffee were not a homogeneous group, as different demographic and lifestyle profiles were identified for: those that did not drink tea or coffee at all; and those that drank only decaffeinated tea or coffee.

Future caffeine research may need to consider whether a broad distinction based on caffeine consumption or non‐consumption alone is always appropriate.

The findings suggest some differences within the caffeinated drink consuming population, including demographic profiles relating to whether consumers drank tea or coffee. They add to the data already available in comparing not only caffeine versus no caffeine, but also characteristics associated with different caffeinated drinks.

Examines the history of coffee drinking. Describes the constituents of coffee and its physiological effects on the drinker. Reviews the research done in the past on caffeine’s effects on health. Recommends a safe level of consumption at between 300‐400mg of caffeine per day which translates to four or five cups of average strength coffee.

Misconceptions about the health effects of coffee and caffeine are common, and, as only a tiny amount of published research ever reaches the public eye, this is perhaps not surprising. The inconsistent and often contradictory results within any subject in coffee/caffeine and health research leads to further confusion, while the stimulatory effects of caffeine are subject to considerable inter‐individual variation, affecting personal attitudes (whether positive or negative) towards caffeinated beverages. Assessing individual research studies on their own merit, and putting into perspective the overall data on a number of health topics, from cardiovascular disease to cancer, does suggest that the health risks of moderate coffee or caffeine consumption are not as great as may have been assumed. Individuals should perhaps not be concerned about the effects of drinking coffee on their physical wellbeing.

Caffeine is a popular ergogenic aid, but its effects on swimming performance are not yet fully clear. Therefore, the purpose of this paper is to examine the effects of caffeine on swimming performance.

Crossover placebo-controlled studies that explored the effects of caffeine on swimming performance were included. Six databases were searched to find relevant studies with additional forward and backward citation tracking. The data were pooled in a random-effects meta-analysis.

Eight studies were included in the review. The main meta-analysis showed a significant ergogenic effect of caffeine ingestion on swimming performance (Cohen’s d: –0.20; 95% confidence interval: −0.32, −0.08; p = 0.0008; –1.7%). In the analysis for short-distance swimming events, caffeine ingestion had a significant ergogenic effect on swimming performance (Cohen’s d: –0.14; 95% confidence interval: –0.27, −0.01; p = 0.03; −1.4%). An ergogenic effect of caffeine was also found in the analysis for moderate-to-long swimming distance events (Cohen’s d: –0.36; 95% confidence interval: −0.67, −0.05; p = 0.02; −2.2%).

The present meta-analysis found that caffeine ingestion decreases the time needed to complete a given swimming event. While these ergogenic effects may be classified as small, they are likely important in swimming, where narrow margins commonly determine placings.

The purpose of this paper is to explore the health effects and safety aspects regarding the consumption of energy drink (ED).

A wide variety of publications was identified through electronic databases (ScienceDirect, PubMed, SciELO, Google Scholar, Link springer and ResearchGate) on the basis of different keyword such as composition, market status, consumption pattern, health effects, consequences and policies related to ED consumption.

Owing to its popularity, various brands of EDs have been introduced in the market along with a wide variety of modifications to attract the consumers of all age groups. EDs comprise majorly active ingredients such as caffeine, taurine, guarana, L-carnitine and glucoronolactone, ginseng and sweeteners. EDs are well known to have good taste, enhance energy levels, physical alertness and performance, but they also pose risk of certain health hazards, i.e. caffeine intoxication. Because of this, different policies have been formulated by various regulatory bodies of respective countries regarding the composition, labelling, distribution and sale of EDs.

This review will provide a brief overview of composition, market status, consumption pattern, health effects, consequences and policies related to ED consumption.

This preliminary paper reviews recent evidence that suggests that there is a strong link between increasing consumption of caffeine and reduced incidence of Parkinson’s disease. Parkinson’s disease currently affects 1 in 1,000 of the general population and has no cure. Whilst the biological changes resulting in Parkinson’s disease symptoms are well known, the initial cause of these is not. Should a relatively simple lifestyle factor such as caffeine be proven to protect against Parkinson’s disease, then this represents a major breakthrough in knowledge about the disease.