Friday 7 October 2011

Dietary Fibre: Types and Nutritional Functions


DIETARY FIBRE
By Tumwebaze Joel
Graduate researcher
School of FTB&N Makerere University Kampala, 2011

Dietary fibre
Definition
Dietary fibre is a complex of substances of cell walls of plants (mainly cereals, fruits and vegetables) which are not digested and not absorbed in a human’s digestive tract. Dietary fibre is also called roughage, bulk though these two terms may be misleading since some forms of fibre are water soluble and aren’t bulky or rough at all. It’s a mixture of substances of polysaccharide character (cellulose, hemicellulose, pectins, gums, mucilages) and non polysaccharide one (lignin).

Saturday 1 October 2011

Artificial Sweeteners

TUMWEBAZE JOEL
Graduate Student Researcher
School of FTB&N
Makerere Universuty Kampala


Definition
Though there is no approved definition for artificial sweeteners by the FDA; in simple terms artificial sweeteners are those that are manufactured, synthetic rather than naturally occurring. Artificial sweeteners are in many cases used as substitutes for sugar in foods and beverages. Unlike sugar, artificial sweeteners are preferred by diabetic patients for their inability to raise blood sugar. 

Types of artificial sweeteners
There are two types of artificial sweeteners, i.e. non caloric sweeteners and sugar alcohols. Non-caloric sweeteners contain no calories, and are hence major ingredients for many foods and drinks. They don’t cause cavities and hence considered a better option than natural sugar. 

On the other hand sugar alcohols or polyols contain fewer calories than sugar. Sugar provides 4kcal/g and sugar alcohols range from 1.5 to 3 kcal/g. They are neither sugars nor alcohols as their name suggests but are carbohydrates with structures that only resemble sugar and alcohol. Are commonly used in chewing gums, candies and throat lozenges but still cause fewer dental problems than natural sugar and lower calorie intake. Examples of sugar alcohols include, sorbitol, mannitol, xylitol, erythritol, isomalt, lactitol, hydrogenated starch hydrolysates and maltitol. Sugar alcohols provide fewer calories than sugar because they aren’t completely absorbed in our bobies therefore high intakes of foods containing sugar alcohols can lead to gas and diarrhea. Any food that contains sorbitol or mannitol must include a warning that excess consumption may have a laxative effect.

Pros and Cons of Artificial Sweeteners
Artificial sweeteners are made of chemicals and have health complications attached to their usage. Saccharine for example, a non alcoholic sweetener can lead to cancer though experiments were confirmed for rats and not humans. Aspartame another non alcoholic artificial sweetener has been shown to cause seizures, headaches and attention deficit disorders. Reports confirming heart palpitations, constipation and swelling of body parts after consuming aspartame have been brought up. Other effects include increase in body weight, fat and caloric intake.
Many people have become addicted to drinks containing diet cokes. More still artificially sweetened foods can lead to a change in taste buds, development of cravings and activation of pleasure centers in the brain that ultimately causes addition.

Though harmful, artificial sweeteners are on the other hand beneficial to human health as they can reduce cavities and tooth decay and also lower body calories. Many bitter drug manufacturers use artificial sweeteners to neutralize the bitterness of certain drugs.
Apart from sucrose other natural sweeteners include; Stevia from the Stevia plant which is known to be beneficial to the diabetics because it doesn’t raise blood sugar. Raw honey is another alternative as it doesn’t cause tooth decay.

Examples of non-caloric artificial sweeteners

Saccharin: is a sulfa-based sweetener whose primary ingredient is benzoic Sulfimide. It is known to be the oldest artificial sweetener first produced in 1878 though it only became popular due to the sugar shortages of World War 1. It is about 300 times sweeter than natural sugar but it’s usually mixed with another sweetener due to its unpleasant metallic aftertaste. Saccharin gained FDA clearance in 1977 and set the recommendation at no more than 5mg per kg of total body weight per day. To determine your average daily intake, devide your weight in lbs by 2.2 to convert it to kgs and then multiply your weight in kgs by 5.The FDA also lifted the requirement that saccharin be labeled as probable carcinogen on food packaging.
Aspartame: is also known as NutraSweet, Equal or sugar twin, Aspartame is made up of phenylalanine, aspartic acid and methanol and it’s about 200 times sweeter than sugar though not widely used in baking because it breaks down at high temperatures. Phenylalanine and aspartic acid directly impact brain and CNS functions; evidence shows they play a role in mood disorders, memory problems and neurological illness.
Methanol is converted into formaldehyde when metabolised though manufacturers claim that methanol and its byproducts are quickly excreted. But research has showed measurable amounts of formaldehyde in the livers, kidneys and brains of test subjects after ingestion of aspartame. Phenylalanine breaks down into Diketopiperazine, a known carcinogen. Phenylalanine is especially dangerous for people with the hereditary disease, Phenylketonuria.
Aspartame gained FDA approval around 1981 and the daily aspartame consumption was set at 50mg per each single kilogram of total body weight.
Cyclamate: this sweetener was banned in the US but still being used in 50 other countries including UK and Canada. For some products sold in both across two countries e.g. US and UK, the ingredient list is altered to fit the country.
Neotame; is one of the newer artificial sweeteners, first approved by FDA for use in 2002. It’s manufactured by NutraSweet to complete the company’s line of aspartame based sweeteners. Neotame is 8,000 times sweeter than table sugar and is marked as a flavor enhancer as well as a sweetener.
Sucralose: 600 times sweeter than table sugar Sucralose is derived from sugar created by a chemical process where the molecular hydrogen and oxygen pairs in sugar are replaced with chlorine molecules, resulting in a sweet substance. Sucralose is nothing like sugar and was discovered while trying to make a new insecticide. Sucralose may have side effects like head and muscle aches, stomach cramps and diarrhea, bladder issues, skin irritation, dizziness and inflammation. A recent study by duke University found Sucralose to reduce healthy intestinal bacteria, which are needed for proper digestion and can impact the effectiveness of prescription and other drugs.
Sucralose gained FDA approval in 1998 and set the daily intake standard at 5mg per kg of body weight daily.
Acesulfame potassium: is a potassium salt containing Methylene chloride a carcinogen. Was first discovered in the 1960’s and is about 200 times sweeter than sugar. It’s usually marketed under the brand name Sunett and is found in some chewing gums, low calorie syrups, and instant gelatin or pudding desserts. Reported side effects include; nausea, headaches, mood disorders, impairment of the liver and the kidneys, problems with eye sight and probably cancer.
It was approved by FDA in 1993 and placed at 15mg per kg of total body weight daily.

Conclusion
Natural Sugar is certainly not your enemy. Refined and processed sugars are! Consume a protein and a whole, unprocessed carbohydrate with every meal, and add healthy fats to your diet. If these meals happen to contain some natural honey or cane juice, don’t sweat it! Eat 4 to 5 servings of fruit and or vegetables each day – there are far too many healthy compounds in these foods to pass them up out of fear of the natural sugar contained within. Make your own choice about artificial sweeteners, but keep in mind that you can easily control your portion sizes and use natural sweeteners instead. Are the potential risks worth the small benefit you may or may not be receiving from artificial sweeteners? Learn to let sugar work with you, not against you!

Saturday 10 September 2011

Check Your Diet: A Guide to Healthy Eating

Check Your Diet: A Guide to Healthy Eating

Healthy Eating
Healthy eating involves adopting new ways of eating or maintaining the good old ones, including reducing levels of sugar, salt and fat intake, adding more fresh fruits, vegetables, and whole grains to the foods you consume. Good nutrition; means getting the calories we need for energy and the nutrients we need for proper growth.
We need to take in note interplay of variety, balance and moderation if we are to achieve good nutrition. 
  • Variety means being adventurous i.e. Choosing different foods in each food group. For example, don’t opt for a banana whenever you have to eat a fruit. Eating a variety of foods each day will help you get all the nutrients you need. Though foods in a certain group have most nutrients in common, they in most cases differ in the levels of such nutrients or even differ in some other micronutrients.
  • Balance means choosing equal or close to equal amounts of all food groups for most days. Except in cases of sickness like ulcers, eat only when you are hungry and stop eating when you are satisfied. The food groups include;
Ø  Fats, oil and sweets
Ø  Milk, yoghurt and cheese group
Ø  The vegetable group
Ø  Bread, cereal, rice and pasta
Ø  Fruit group
Ø  Meat, poultry, fish, dry beans, eggs and nuts
Eating in moderation means to avoid eating too much or too little of a certain food. Eating fats in moderation can be healthy while eating too much of fruits can some times be disastrous.
How to stay on track of healthy eating
ü  By making healthy eating a habit. You should first know why you need to eat healthy basing on the advantages of healthy eating described latter on. Then you should think of the changes you can make to your eating habits taking into note affordability, ability to maintain the change and liking. Make sure to set short, medium and long term objectives about adjustment of you diet i.e. avoid big drastic changes.
ü  Talk to a registered dietician, family members and friends in order to have a proper plan. You should know when you need a hand to make shopping, cooking and meal planning assistance.
ü  Set the mealtime mood. Set the table, light candles, play music, or eat outside or by a window when possible. Tidying yourself and your space will help you enjoy the moment.
ü  Break habits. If you eat watching TV, try eating while reading. If you eat at the counter, curl up to a movie and a slice of veggie pizza.
ü  Take advantage of home delivery. Many grocery stores have Internet or phone delivery services.
ü  Swap services. Ask a friend, neighborhood teen or college student if they would be willing to shop for you.
ü  Share your home. If you live alone in a large home, consider having a housemate / companion who would be willing to do the grocery shopping and cooking.
ü  Hire a homemaker. Try to find someone who can do the shopping and meal preparation for you. For more information,
ü  Avoid skipping meals – This causes your metabolism to slow down, which leads to feeling sluggish and poorer choices later in the day.

Limitations to healthy eating
Work loads: Due to a lot of work many of us are pressed by time, we favour our bosses over our health. Its true preparing own food is takes a lot of time but it’s because we don’t budget for our time. Secondly, we want convenience and that’s why we buy prepackaged processed, canned, frozen foods which are ready to eat or need minimal preparation. Many advertisements on televisions are misleading and lead us into processed foods.
Loneliness and depression: For some, feeling down leads to not eating and in others it may trigger overeating. Be aware if emotional problems are affecting your diet, and take action by consulting your doctor or therapist.
Death or divorce of a pattern: Newly single seniors may not know how to cook or may not feel like cooking for one. People on limited budgets might have trouble affording a balanced, healthy diet. See the resources below for suggestions on cooking for one and easy, healthy menu selections.

Advantages of healthy eating
Energy: whole foods such as fruits and vegetables, whole grains in healthy snacks and breads, and foods with a healthy amount of lean protein are not only healthier, but they keep your blood sugar pretty stable throughout the day, which equals more energy for you. The healthier our diet is, the more energy we have. Foods that are easier to digest make energy more readily available to our body. Stimulants such as caffeine and sugar give us a lift but then we crash and our body craves more. Stable energy levels provided by high quality nutrition keep us going throughout the day.
Boost up of immunity: our immune system is built and maintained from the food we eat. A diet of processed and convenience food not only lacks nutrients, it draws from our body's reserves for digestion and metabolism. This depletes vitamins, minerals and antioxidants necessary to ward off disease and fight infection. A healthy diet should contain all these elements in abundance to give our immune system the power to protect us. Eating healthy will directly correlate to your overall health. You will then be able to fight off and maybe even avoid common illnesses such as colds, the flu, and sinus infections. More importantly though, you will also reduce your risk for major illnesses and diseases like diabetes and heart disease.
You will look better: Even if you are not “overweight”, you might have more fat than you realize. A healthy diet will lower your body mass index, improve your skin and skin elasticity, your nails and hair, and even your teeth. Our skin, hair, and tissues are all built from what we eat. Supple, smooth and glowing skin requires vitamins, minerals, antioxidants and essential fatty acids, as does glossy hair, sparkling eyes and strong nails. A nutrient-rich diet gives us a natural glow
You set a good example for your loved ones and kids: This is a big one for me. What are you teaching your kids, or, if you are young, are you following in your parent’s footsteps? How do they eat, are they healthy? Just some food for though here, but the way you choose to eat will rub off on others!
And lastly, you will simply live longer, and have greater opportunities to enjoy life more.
There are many other reasons as to why eat healthy. You may already have a disease and want to manage it, you may be pregnant, or you may want to simply just feel better. Whatever your reasons, eating healthy should be a way of life and not just a few weeks here and there!
Simple meal plan for you
  • Breakfast – Select high fiber breads and cereals, colorful fruit, and protein to fill you with energy for the day. Try yogurt with muesli and berries, a veggie-packed omelet, peanut-butter on whole grain toast with a citrus salad, or old-fashioned oatmeal made with dried cherries, walnuts, and honey.
  • Lunch – Keep your body fueled for the afternoon with a variety of whole-grain breads, lean protein, and fiber. Try a veggie quesadilla on a whole-wheat tortilla, veggie stew with whole-wheat noodles, or a quinoa salad with roasted peppers and mozzarella cheese.
  • Dinner – End the day on a wholesome note. Try warm salads of roasted veggies and a side of crusty brown bread and cheese, grilled salmon with spicy salsa, or whole-wheat pasta with asparagus and shrimp. Opt for sweet potatoes instead of white potatoes and grilled meat instead of fried.
  • Snacks - It’s okay, even recommended, to snack. But make sure you make it count by choosing high-fiber snacks to healthfully tide you over to your next meal. Choose almonds and raisins instead of chips, and fruit instead of sweets. Other smart snacks include yogurt, cottage cheese, apples and peanut butter, and veggies and hummus.