Functional Foods for Health Status and Social Well Being

Functional foods have extra health beneficial components other than basic nutrients. Carotenoids, flavonoids, poly phenols occupied the major share of functional foods. Fruits and vegetables are rich source of these functional components. Nutricereals are also rich in phytochemicals and dietary fibres and provide protection against many diseas -es. The focus of present review is on potential health benefits of functional foods and some traditional preparations.


Introduction
The primary role of diet is to provide enough nutrients to meet metabolic requirements, while giving the consumer a feeling of satisfaction and well-being. Recent knowledge, however, supports the hypothesis that, beyond meeting nutrition needs, diet may modulate various physiological functions and may play detrimental or beneficial roles in some diseases [1]. Now concepts are expanding from the past emphasis on survival, hunger satisfaction, and preventing adverse effects to an emphasis on the use of foods to promote a well-being state, improving health, and reducing the risk of diseases. These concepts are particularly important for increasing cost of health care, the steady increase in life expectancy and the desire of older people for improved life quality [2].
Functional food is a recent concept that originated in Japan but was further developed in the United States, Europe and other parts of the world. This concept implies that foods and food components have the ability to beneficially influence body functions to help improve the state of well-being, health and reduce the risk of diseases. The market of these products is significant [3]. In total, more than 1700 functional food products have been launched in Japan between 1988 and 1998 with an estimated turnover of around 14 billion US$ in 1999. The market was estimated to be 5 billion US$ in 2003 (Side, 2006) [4] and 5.73 billion US$ in 2006, while more than 500 products were labeled as FOSHU in 2005 [4,5].
From a practical point of view, a functional food can be: A natural food in which one of the components has been natu-• rally enhanced through special growing conditions.
A food to which a component has been added to provide ben-• efits (e.g. the addition of selected probiotic bacteria with proven health benefit characteristics to improve gut health).
A food from which a harmful component has been removed so • that the food has less adverse effects on health (e.g. the reduction of Saturated Fatty Acids [SFA]).
A food in which the nature of one or more components has • been chemically modified to improve health (e.g. the hydrolysed protein in infant formulas to reduce the likelihood of allergenicity).
A food in which the bioavailability of one or more compo-• nents has been increased to provide greater absorption of a beneficial component.  The most prominent types of functional products are presented briefly as follows:

Functional Fruits
Apart from traditional fruits, the functional fruits and vegetables like pomegranate, kiwi, Cranberry, Bottle guard, Bitter guard have meticulous health beneficial effects. Some of them are discussed here:

Pomegranate
The health benefits of pomegranate have been attributed to its wide range of phytochemicals, which are predominantly polyphenols, including primarily hydrolyzable ellagitannins, anthocyanins, and other polyphenols (Table 2). Antioxidant activity of pomegranate has been attributed to its high polyphenolic content, specifically punicalagins, punicalins, gallagic acid, and ellagic acid.  Pomegranate juice exert antiatherogenic, antioxidant, antihypertensive, and anti-inflammatory effects.

Punicic acid, a conjugated fatty acid present in pomegranate •
has an in vivo anti-inflammatory effect by limiting neutrophil activation and lipid peroxidation consequences.
Pomegranate fruit and derivates endowed with a very high • antioxidant activity as an antiproliferative, antiinvasive, and pro-apoptotic agent in various cancer cell lines and animal models The protective effects of pomegranate polyphenolics against • UVA-and UVB-induced cell death of human skin fibroblasts may be attributed to reduced generation of intracellular ROS and increased intracellular antioxidant capacity Pomegarnate peel possesses antibacterial properties. Several • studies conducted on aril juice is reported to possess anti viral activity.

Kiwi Fruit
Kiwi fruit is rich in vitamin C, Lutein and Xanthine and exert strong antioxidant activity. It helps to prevent cardiovascular diseases, cancer, insomnia. It improves the iron absorption and digestion.

Cranberry
Cranberry is a rich source of bioactive phenolic compounds with antiproliferative, antioxidant, anti-inflammatory, and antimicrobial activities. Cranberries contain bioactive compounds such as anthocyanins, flavonoids and tannins. Cranberry has been traditionally used to treat and prevent urinary-tract infections.

Tomatoes
Lycopene is the principal component of the tomato. It exhibits strong antioxidant effects to higher number of conjugative double bonds. Lycopene helps in prevention of prostate cancer and stress induced diseases.

Amla
Amla is a rich source of Vitamin C. Amla enhances food absorption, balances stomach acid, fortifies the liver, nourishes the brain and mental functioning, supports the heart, strengthens the lungs, regulates elimination of free radicals, enhances fertility, helps the urinary system, increases skin health, promotes healthier hair, acts as a body coolant, flushes out toxins, increases vitality, strengthens eyes, improves muscle tone and, acts as an antioxidant. Amla is used for hair lose, eye sight, cardiovascular disease, diarrhea, digestion disorders etc. it possesses anti-ageing components and helps in mineral absorption.
Fruits industry byproducts are rich source of dietary fibres and other bioactive compounds. Several studies have been focused on extraction of bioactive compounds from FP (Struck et al., 2016) [31].

Probiotics
Probiotics are defined as ''live microorganisms, consumed in adequate numbers for health benefit on the host''. Lactic Acid Bacteria (LAB) and bifidobacteria, the most studied and widely employed bacteria within the probiotic field, are normal components of the intestinal microbiota and have a long tradition of safe application within the food industry [32]. This success of dairy probiotics can partly be explained by their general positive image among consumers [33,34]. Recently, encapsulation was found as possible technology for decreasing sensitivity of probiotics [35,36]. Fruit juice has also been suggested as a novel, appropriate medium for fortification with probiotic cultures [37]. Now a days, encapsulation of active ingredients like probiotics is used to ensures that the bioactive compounds remain stabilized and maintains their bioavailability [38].

Prebiotics
Prebiotics are non-digestible food ingredients that beneficially affect the host by stimulating the growth and/or activity of one or a limited number of bacteria in the colon, thus improving host health. Fructo-Oligosaccharide (FOS), inulin, Isomalto-Oligosaccharides (IMO), polydextrose, lactulose and resistant starch are considered as the main prebiotic components. Oligosaccharides play important role in obesity control [39]. Besides being prebiotics, these compounds have shown to increase calcium absorption, thus improve both bone mineral content and Bone Mineral Density (BMD) [40]. Furthermore, they influence the formation of blood glucose, and reduce the levels of cholesterol and serum lipids [41]. Prebiotics enhance the growth and survival of the probiotic cultures by influencing the growth and metabolites of both the probiotic and the starter. Due to the potential synergy between probiotics and prebiotics, foods containing a combination of these ingredients are often referred to as synbiotics [42].

Functional drinks
Another important product category within the functional food segment is non-alcoholic beverages fortified with vitamins A, C and E or other functional ingredients. Although, there is a relatively high number of a product available in this segment e.g. functional drinks are those of cholesterol-lowering drinks (with combination of omega-3 and soy), ''eye health'' drinks (with lutein) or ''bone health'' drinks (with calcium and inulin) [43].
In India, the tea is popular drink among Indian population. In some regions, the tea is incorporated with different spices and herbs which add the nutritional value to tea. Several researchers have reported the health beneficial effects of herbal tea [44,45]. Masala tea becoming quite popular all over world and excellent for preventing seasonal diseases, cough, cold, fever and influenza etc (Table 3). Juice Blends: A Juice blend of Pomegranate, Amla and green turmeric is consider being excellent for post cancer operated patients and coronary heart diseases. The medicinal of pomegranate and amla is already mentioned in this article. The turmeric is also known for its meticulous antiseptic, antioxidant, anti-inflammatory, neuroprotective, cardioprotective, anti depression and anti ageing effects. Curcumin (generally 3%) is the main active ingredient in turmeric. It has powerful anti-inflammatory effects and is a very strong antioxidant. Curcumin also helps to relieve arthritis pain.
Functional soup -Moringa dried/fresh leaves powder/paste soup amalgamated with sweet corn, green pea, ginger, black pepper and cardamom is commonly used by Indian population. Moringa leaves possess good quality proteins and several medicinal effects. Moringa is also rich in vitamin A, B and C and minerals like calcium, iron and phosphorous. Moringa helps in the prevention of diabetes and high blood pressure. Other components of soup also contribute to the excellent taste and medicinal value.

Functional cereals
Oat and barley, offer another alternative for the production of functional foods. Cereals can be used as fermentable substrates for the growth of probiotic microorganisms. Additionally, cereals can be applied as sources of non-digestible carbohydrates that besides promoting several beneficial physiological effects can also selectively stimulate the growth of lactobacilli and bifidobacteria present in the colon and act as prebiotics. Cereals contain water soluble fiber, such as beta-glucan and arabinoxylan, oligosaccharides, such as galacto and fructo-oligosaccharides and resistant starch, which have been suggested to fulfill the prebiotic concept. Finally, cereal constituents, such as starch, can be used as encapsulation materials for probiotics in order to improve their stability during storage and enhance their viability during their passage through the adverse conditions of the gastrointestinal tract [46]. Some functional cereal components such as beta-glucan, however, applied also in the dairy and bakery industries. Recent research has focused on the use of beta-glucans, in the manufacture of low-fat ice creams and yogurts. Incorporation of beta-glucans with other soluble dietary fiber, into low-fat dairy products can make their mouthfeel, scoopability and sensory properties resemble those of full-fat products [46].
Food industrial By-Products (BP) are rich sources of functional ingredients, such as fibre, minerals, and phytochemicals can be fortified in bakery products [47][48][49].
In India, the lactating women take some traditional food supplements made from Rice/Wheat Flour, dry fruits, nuts and seeds, ghee (Clarified Butter), resins, herbs, brown/black pepper, coconut shreds, gums etc. These traditional supplements are not only energy rich but also provide minerals and vitamins (Table 4).

Functional meat
Meat and its derivatives may also be considered functional foods to the extent that they contain numerous compounds thought to be functional. The idea of using food for health purposes rather than for nutrition opens up a whole new field for the meat industry. In addition to traditional presentations, meat industry can explore various possibilities, including the control of the composition of raw and processed materials via reformulation of fatty acid profiles or inclusion of antioxidants, dietary fiber or probiotics, etc [50].

Perspectives
The future viability and success of functional foods in the marketplace depend on several elements. The key issue is consumer acceptance of such products. For consumers to agree to pay the cost associated with functional foods, they must be convinced by its health claims through clear, truthful, and unambiguous messages.