With their high content of phytochemicals such as flavonoids, tannins, stilbenoids, phenolic acids and lignans [43-45] berries and berry products are potentially excellent antioxidant sources. The phytochemical content of berries varies with geographical growing condition, and between cultivars [46,47] explaining the variations found in our study. During the processing of berries to jams, total phenol content is reduced [48] resulting in lower antioxidant values in processed berry products than in fresh berries.
The American Journal of Clinical Nutrition featured a study that found those with high levels of vitamin C in their blood had almost a 50 percent decreased risk of stroke. Countless studies also have found that people who consume highly plant-based diets — loaded with things like fresh veggies, herbs, spices and fruit — have a better chance of living longer and healthier lives with less heart disease. (6)
Hence, cancer therapies should attempt to regulate blood-glucose levels through diet, supplements, exercise, medication when necessary, gradual weight loss and stress reduction. Since cancer cells derive most of their energy from anaerobic glycolysis, the goal is not to eliminate sugars or carbohydrates entirely from the diet but rather to control blood-glucose within a narrow range to help starve the cancer cells and boost immune function.
Before you swap refined sugar for artificial sweeteners, you may want to keep reading. Artificial sweeteners also appear to have several negative effects on the brain. Sweeteners, such as aspartame, sucralose, and saccharin, are not healthy alternatives to sugar. These sweeteners are in a variety of foods and drinks, such as diet soda, sugar-free snacks, and energy drinks.
Dark chocolate is high in calories (150-170 calories per ounce) and can contribute to weight gain if eaten in excess. However, chocolate, like nuts can induce satiety, so the longer term implications for weight control are not clear.  It also contains a moderate amount of saturated fat, which can negatively affect blood lipid levels, though its heart-protective effects from flavanols appear to outweigh the risk. Choosing dark chocolate and eating modest quantities may offer the greatest health benefits.
So, what can you do to satisfy your sweet tooth? Due to the research on the negative effects of sugar on the brain, it’s best to limit foods high in sugar. It’s also important to steer clear of artificial sweeteners. Fortunately, there are some alternatives to enjoy a sweet treat while avoiding the health risks. Below are a few options to consider:
Candy as a diabetes foe? Sure enough. In a small Italian study, participants who ate a candy bar's worth of dark chocolate once a day for 15 days saw their potential for insulin resistance drop by nearly half. "Flavonoids increase nitric oxide production," says lead researcher Claudio Ferri, M.D., a professor at the University of L'Aquila in Italy. "And that helps control insulin sensitivity."
“Dr. David Reuben, author of Everything You Always Wanted to Know About Nutrition says, “white refined sugar-is not a food. It is a pure chemical extracted from plant sources, purer in fact than cocaine, which it resembles in many ways. Its true name is sucrose and its chemical formula is C12H22O11. It has 12 carbon atoms, 22 hydrogen atoms, 11 oxygen atoms, and absolutely nothing else to offer.” …The chemical formula for cocaine is C17H21NO4. Sugar’s formula again is C12H22O11. For all practical purposes, the difference is that sugar is missing the “N”, or nitrogen atom.”
So what did the study show? The researchers found that the flavanol content of cocoa powder (30.1 milligrams per gram) was significantly greater than all of the other super fruit powders. It was also revealed that dark chocolate’s antioxidant capacity was higher than all of the super fruit juices except pomegranate. The total polyphenol content per serving was also highest for dark chocolate (about 1,000 milligrams per serving), which was significantly higher than all of the fruit juices except pomegranate juice. (11)
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But before you run out and stock up on chocolate bars, it’s important to note that you’d have to eat about seven bars a day to ingest the 138 milligrams of epicatechin given to the study participants. A healthy portion of dark chocolate is about 1.5 ounces. However, the results do suggest an important link between the compound and memory-loss. Certain supplements contain healthy doses of epicatechin, and the antioxidant can also be found naturally in apples, blackberries, and green tea. 
While it may be too soon to truly list improvements in vision as a concrete benefit of dark chocolate, one June 2018 human clinical trial observed how the contrast sensitivity and visual acuity of  thirty participants without pathologic eye disease changed after consuming dark chocolate versus milk chocolate. Researchers found contrast sensitivity and visual acuity were higher two hours after eating a dark chocolate bar compared to eating milk chocolate. The study, however, concludes the duration of these effects and their real-world implications require further testing. (12)
The deep red color of cherries is due to high levels of anthocyanins, also found in blueberries, which reduce inflammation and help lower cholesterol. Canned tart or sour cherries and dried sweet cherries both scored higher for antioxidants than the sweet, fresh variety. Tart cherries pack an added bonus: melatonin, which might help regulate sleep cycles.
Initial studies have been carried out to examine the association between intake of antioxidant rich foods and their health effects [67,70]. Some of these studies describe a beneficial effect on oxidative stress related chronic diseases, e.g. from intake of nuts [49,69], pomegranates [71-73], tomatoes [6], coffee [74], tea [54,75,76], red wine [77-79] and cocoa [56]. The highly reactive and bioactive phytochemical antioxidants are postulated to in part explain the protective effect of plant foods. An optimal mixture of different antioxidants with complementary mechanisms of action and different redox potentials is postulated to work in synergistic interactions. Still, it is not likely that all antioxidant-rich foods are good sources and that all antioxidants provided in the diet are bioactive. Bioavailability differs greatly from one phytochemical to another [26,27,80], so the most antioxidant rich foods in our diet are not necessarily those leading to the highest concentrations of active metabolites in target tissues. The antioxidants obtained from foods include many different molecular compounds and families with different chemical and biological properties that may affect absorption, transport and excretion, cellular uptake and metabolism, and eventually their effects on oxidative stress in various cellular compartments [24]. Biochemically active phytochemicals found in plant-based foods also have many powerful biological properties which are not necessarily correlated with their antioxidant capacity, including acting as inducers of antioxidant defense mechanisms in vivo or as gene expression modulators. Thus a food low in antioxidant content may have beneficial health effects due to other food components or phytochemicals executing bioactivity through other mechanisms.
An ongoing 40-year study on the effects of chocolate on cognitive function was recently finished. The study used data from the beginning of the study and compared it through cross-sectional study. This might not mean that chocolate makes people smarter—perhaps smart people happen to eat chocolate. Regardless, the study also concluded that all the types of intelligence measured previously were increased by chocolate consumption—along with spoken word recall. 
Lung, prostate, breast, ovarian, bladder, oral and skin cancers have been demonstrated to be suppressed by retinoic acid. (9) Another study collected numerous references demonstrating the findings of retinoic acid in protection against melanoma, hepatoma, lung cancer, breast cancer and prostate cancer. However, there’s evidence indicating that the benefits of chemicals like retinoic acid are safest when obtained from food naturally, rather than supplements.
When classifying the samples into the three main classes the difference in antioxidant content between plant- and animal-based foods become apparent. The results here uncover that the antioxidant content of foods varies several thousand-fold and that antioxidant rich foods originate from the plant kingdom while meat, fish and other foods from the animal kingdom are low in antioxidants. Comparing the mean value of the 'Meat and meat products' category with plant based categories, fruits, nuts, chocolate and berries have from 5 to 33 times higher mean antioxidant content than the mean of meat products. Diets comprised mainly of animal-based foods are thus low in antioxidant content while diets based mainly on a variety of plant-based foods are antioxidant rich, due to the thousands of bioactive antioxidant phytochemicals found in plants which are conserved in many foods and beverages.
Most of the spices and herbs analyzed have particularly high antioxidant contents. Although spices and herbs contribute little weight on the dinner plate, they may still be important contributors to our antioxidant intake, especially in dietary cultures where spices and herbs are used regularly. We interpret the elevated concentration of antioxidants observed in several dried herbs compared to fresh samples, as a normal consequence of the drying process leaving most of the antioxidants intact in the dried end product. This tendency is also seen in some fruits and their dried counterparts. Thus, dried herbs and fruit are potentially excellent sources of antioxidants.
As demonstrated in the present study, the variation in the antioxidant values of otherwise comparable products is large. Like the content of any food component, antioxidant values will differ for a wide array of reasons, such as growing conditions, seasonal changes and genetically different cultivars [46,58], storage conditions [59-61] and differences in manufacturing procedures and processing [62-64]. Differences in unprocessed and processed plant food samples are also seen in our study where processed berry products like jam and syrup have approximately half the antioxidant capacity of fresh berries. On the other hand, processing may also enhance a foods potential as a good antioxidant source by increasing the amount of antioxidants released from the food matrix which otherwise would be less or not at all available for absorption [65]. Processing of tomato is one such example where lycopene from heat-processed tomato sauce is more bioavailable than unprocessed tomato [66]. The large variations in antioxidant capacity observed in the present study emphasize the importance of using a comprehensive antioxidant database combined with a detailed system for food registration in clinical and epidemiological studies.
The American Journal of Clinical Nutrition featured a study that found those with high levels of vitamin C in their blood had almost a 50 percent decreased risk of stroke. Countless studies also have found that people who consume highly plant-based diets — loaded with things like fresh veggies, herbs, spices and fruit — have a better chance of living longer and healthier lives with less heart disease. (6)
Stresses the Liver: “When we eat fructose, it goes to the liver. If liver glycogen is low, such as after a run, the fructose will be used to replenish it (3).However, most people aren’t consuming fructose after a long workout and their livers are already full of glycogen. When this happens, the liver turns the fructose into fat (2). Some of the fat gets shipped out, but part of it remains in the liver. The fat can build up over time and ultimately lead to Non-Alcoholic Fatty Liver Disease (4, 5, 6).”