Nutrition and Health

🥗 NUTRITION AND HEALTH

🚧 Obstacles to Healthy Living

We have seen that people cite many reasons for not leading healthful lifestyles, and some of the obstacles they face vary in how difficult they are to overcome. 😔 Good health depends on our eating healthfully. 💪 Nutrition is a critical factor in health and wellness—and it is one that people can control. 🎯

We will focus on this factor now. In doing so, keep in mind that the physical and chemical components of the human body are affected continuously by nutrients—substances in food that the body can use in its biological processes. 🧪 Let's look first at the components of food and how they affect our health. 🔍

🍽️ COMPONENTS OF FOOD

💧 Essential Nutrients

Food is composed of several components, the most important of which are the following six: 6️⃣

1. 💧 Water
2. 🍞 Carbohydrates
3. 🥑 Fats
4. 🥩 Proteins
5. 💊 Vitamins
6. ⚡ Minerals

These are considered as nutrients because they are needed in the building, maintenance, and functioning of each of the billions of cells that exist in the body. 🔬

🍞 Carbohydrates

Carbohydrates are the body's major source of energy. ⚡ They are composed of carbon, hydrogen, and oxygen. The simple sugars, such as glucose and fructose, contain only one or two sugar molecules, and complex sugars contain many such molecules. 🧪

• Glucose 🍯 is used directly by cells for energy and is present in the bloodstream as blood sugar. It is found in many food products from animal sources. 🥛
• Fructose 🍎 is converted by the body to glucose and is found in fruits and honey. 🍯

Three complex sugars are important in our diets: 3️⃣

• Sucrose 🧂 is our ordinary table sugar and is derived from sugar cane and sugar beets. 🌾
• Lactose 🥛 is found in milk. 🐄
• Starch 🥔 is found in plant products such as grains, potatoes, and vegetables. 🥦

🥑 Lipids (Fats)

Lipids, or fats, also provide energy to the body. 💪 The main source of fats is food; the body produces some fats and obtains some from storage deposits in the body. 🏪 Of all the components of food, Americans probably worry most about fats. 😰

There are several types of lipids that differ in their effects on our blood cholesterol levels. 🩸 There are:

1️⃣ Saturated Fat

Saturated fat 🥩—is used by the liver to manufacture cholesterol, thereby raising blood cholesterol levels. It is the most hazardous dietary fat. 🚨 Public health recommendations specify it should make up no more than 10% of our caloric intake. Its sources include meats, butter, and coconut and palm oils. ⚠️

2️⃣ Polyunsaturated Fat

Polyunsaturated fat 🌻—tends not to raise blood cholesterol levels and appears to be harmless. Examples include safflower, sunflower, corn, vegetable, and soybean oils and margarine. ✅

3️⃣ Monounsaturated Fat

Monounsaturated fat 🫒—has little or no effect on cholesterol. Examples include olive and canola oils. ✅

4️⃣ Trans Fats

Trans fats ⚠️—By-products of hydrogenation, are structurally similar to saturated fat and have a great impact: they raise total and "bad" (LDL) cholesterol levels. 📈 They are found in stick margarine and many commercially prepared cakes, cookies, and snack foods. 🍪

💡 Dietary Recommendations

Health experts generally recommend that people limit their total fat consumption to not more than 30% but not less than 10% of their calories. ⚖️

🥩 Proteins

Proteins are important mainly for body growth and cell repair and replacement. 💪 They consist of organic compounds called amino acids. The body synthesizes many amino acids; there are about 20 amino acids in nature, perhaps half of which are essential for bodily growth and functioning and must be provided by diet. 🍽️ Animal products, such as meats, 🥩 poultry, 🍗 fish, 🐟 eggs, 🥚 and dairy products, 🥛 contain all of the essential amino acids. Most vegetables do not. 🥬 Individuals who eat no animal products can still eat a varied diet of vegetables that provides all of the essential amino acids. 🌱

💊 Vitamins

Vitamins are organic chemicals that regulate metabolism and a variety of other body functions. 🔧 They are also used in converting nutrients to energy, producing hormones, and breaking down waste products and toxins. 🧪

Some vitamins dissolve in fats and others in water. ✅ The main fat-soluble vitamins are A, D, E, and K, which dissolve in fats and are stored in fatty tissues. 💧 The main water-soluble vitamins are B and C. The body stores little of these substances, and excesses are excreted as waste. 🚰

⚡ Minerals

Minerals are inorganic substances—examples are calcium, phosphorus, potassium, sodium, iron, iodine, and zinc. 🧪 Each mineral is important in the body's development and functioning. For instance:

• 🦴 Calcium and phosphorus are important in forming bones and teeth.
• ⚡ Potassium and sodium are involved in the transmission of nerve impulses.
• 🩸 Iron is the critical oxygen-carrying component of the blood.

🌾 Fiber

Fiber is not considered a nutrient because it is not used in the body's metabolic processes. 🚫 But it is needed for proper digestion. Whole grain breads and cereals, for example, have much more fiber than those that are enriched or fortified. 🍞

📊 Fiber Facts

There are two types of fiber: 2️⃣

• Soluble fiber 💧—such as in oat bran and dried beans, can lower cholesterol in many people. ✅
• Insoluble fiber 🌾—such as in wheat bran, has many benefits, including helping people to control their weight by making them feel "full". ⚖️

People can get all the nutrients and fiber they need from the foods they eat by consuming a varied diet. 🍽️ To help people understand the variety of foods needed for good nutrition, the U.S. government created the Food Guide Pyramid. 📊

🏛️ THE FOOD GUIDE PYRAMID

📊 Understanding the Pyramid

The Food Guide Pyramid is a diagram that was developed by the U.S. Food and Drug Administration to help guide people toward eating healthfully by showing the relative amounts of various types of foods people should consume. 🎯 As you can see in the diagram, the types of food are grouped by their nutrients, with similar types put together. 🗂️

🌾 Level 1: Grains (Base)

Whole grain bread, cereal, pasta, and rice 🍞—foods in this group should make up the largest portion of a healthful diet. Eat liberally means that the frequent use of these foods has good effects. ✅

🥦 Level 2: Fruits and Vegetables

Fruit group 🍎 and Vegetable group 🥗—Eat generously means that regular use of these foods is likely to have good effects. ✅

🥩 Level 3: Protein and Dairy

Nut, seed, meat alternative group 🥜—including meat, poultry, fish, dry beans, eggs, seeds, and nuts. 🥩🍗🐟

Milk, yogurt, and cheese group 🥛—including low-fat and non-fat milk, low-fat yogurt, fresh cheese, and dairy products that are low in fat ratio. 🧀

Consume moderately means that use is good but excessive use is not recommended. ⚖️

🍰 Top Level: Fats and Sweets

Fats, oils, and sweets group 🧈🍭—with high-fat foods, consume sparingly means that very low quantities of these foods are required by the body and good to use, but using too much is not recommended and is hazardous. ⚠️

💊 Supplements

Most people who eat healthfully don't need any supplement of vitamins or other nutrients. One carrot, 🥕 for instance, provides as much vitamin A as individuals need for 4 days. 4️⃣ Pregnant women have greater needs for some nutrients and should take supplements as recommended by their physicians after adjustments are made in their diets. 🤰

Some people adopt the attitude that "if some is good, more is better." ⚠️ But they can overdo the use of some nutrients—too much salt, for example, is associated with high blood pressure. 🩺 And some vitamin and mineral supplements in large amounts can accumulate in the body and lead to poisoning. Too much of vitamins A and D, for instance, can cause very serious hazards to the liver and kidneys, respectively. 🚨

Whether supplements of vitamin C or E have any value in promoting health is still unclear and controversial. 🤔 Vitamin C, for example, has been recommended for prevention and cure of colds, 🤧 prevention of cancer, 🎗️ and prevention of heart disease. 💔 But the case for these benefits is not supported by solid evidence. ❌

🥫 Food Processing and Additives

Unprocessed foods, such as fresh fruits and vegetables, 🥗 are generally more healthful than processed foods, such as ready-to-eat and packaged dinners. 📦 Processed foods often contain additives—such as antioxidants, emulsifiers, food colors, and preservatives—that add to the food industry's profit but not to the consumer's health. 💰

Most additives are not themselves dangerous, although some people are allergic to them. But additives can affect health in other ways: some may be carcinogenic. 🚨 And because the substances can build up in the body and have cumulative effects, children are especially vulnerable 👶 because their body systems are still forming and maturing rapidly and because they eat more, pound for pound, than adults do. 🍽️

😔 MALNUTRITION

🌍 Global Crisis

Enormous numbers of children worldwide simply do not have nutritious diets available to enable them to grow and develop properly. 😢 In many nations, especially those that are very poor, a substantial portion of children are stunted from malnutrition. 📉 In several nations, such as Ethiopia, Guatemala, and India, half or more of the children show stunted growth. 🌍

A study of the average heights of children throughout the world revealed that the smallest children lived in the most highly impoverished areas of Asia, Africa, and Latin America, and the tallest children lived in relatively wealthy locations in North America, Europe, and Japan. 📊 These findings suggest that malnutrition can affect large segments of the world's population, especially people in impoverished countries. 💔

🍔 NUTRITION, DIET, AND HEALTH

⚠️ Dietary Excesses

In many nations, such as the United States, the main nutritional problem is not malnutrition. Instead, it is dietary excesses—particularly of fat, cholesterol, and salt. 🧂 These dietary characteristics are closely associated with the development of several major chronic diseases, such as atherosclerosis, hypertension, and cancer. 🏥

💔 Diet and Atherosclerosis

Cholesterol is the main dietary culprit in the development of atherosclerosis—fatty plaques that build up in blood vessels. 🩸 Our bodies produce most of the cholesterol in our blood; the remainder comes from our diets. 🍽️

🧪 Types of Cholesterol

Whether cholesterol forms plaques along artery walls appears to depend on the amount of different types of lipoproteins in the blood: ⚖️

• Low-density lipoprotein (LDL) 🔴 and very-low-density lipoprotein (VLDL) are related to increased plaque deposits and are often referred to as "bad cholesterol." They mix with other substances to form plaques. ⚠️
• High-density lipoprotein (HDL) 🟢 is linked to decreased plaque buildup and has been called "good cholesterol" because it seems to carry LDL away for the liver to process and clear from the body. ✅

🥑 Other Dietary Factors

Other types of dietary fat play a role, too: 📊

• 🐟 Omega-3 fatty acids found in fish raise HDL levels. ✅
• 🧈 Trans fatty acids in oils like margarine that are processed increase LDL. ⚠️

📈 Risk Factors

Experts once believed that people whose long-term blood or total serum cholesterol level was over 240 milligrams of cholesterol per 100 milliliters of blood (mg/dl) were at high risk for heart disease and stroke. 🩺 Their view has become more refined: LDL is the real culprit. 🎯

The cardiovascular risk that people's cholesterol levels pose depends on five other risk factors: 5️⃣

1. 👴 Age (over 45 years for males, 55 for females)
2. 👨‍👩‍👦 Family history of early cardiovascular disease
3. 🚬 Cigarette smoking
4. 🩺 High blood pressure
5. 📉 Low levels of HDL (under 40 mg/dl)

🎯 Managing Cholesterol

Cholesterol levels are determined partly by heredity 🧬 and partly by lifestyles. Factors to consider:

• 🚬 Cigarette smoking may increase LDL and decrease HDL levels. ⚠️
• 🍳 Diet is also an important factor. Some foods, such as eggs, many milk products, and fatty meats, contain very high concentrations of cholesterol. Health experts recommend that daily cholesterol intake should not exceed 300 mg and should be much lower for people at moderate or high risk for cardiovascular disease. 🎯

👶 Children and Cholesterol

Children beyond the preschool years should follow adult-like diets, and those whose parents or grandparents had early heart disease need to have their cholesterol levels and diets assessed. 🩺 Two reasons for this are:

1. 🔬 The process of atherosclerosis can begin in childhood.
2. 🍔 Children need to establish good eating habits early, in childhood, to avoid entrenched unhealthful dietary patterns later, in adolescence and adulthood. ⏳

✅ Benefits of Lowering Cholesterol

Does lowering serum cholesterol reduce cardiovascular illness? Yes. 💪 Studies have demonstrated that large reductions in cholesterol with combined diet and drug treatment retard—and often reverse—the development of atherosclerosis and greatly reduces the risk of heart attack among people with and without heart disease. ✅

🩺 Diet and Hypertension

Of all the dietary substances that may affect blood pressure, sodium plays the strongest role. 🧂 High levels of sodium consumption can increase blood pressure and stress reactivity. 📈

🧂 Sodium Guidelines

Because of sodium's effects, health experts recommend that people consume less than 2,300 mg of sodium daily—an amount equal to about 1 teaspoon of salt. ⚖️ But American adults consume an average of 3,270 mg of sodium daily, and children consume similarly high amounts for their size. 📊

Where does all that sodium come from? 🤔 Most foods contain some sodium, even before we eat them or add salt in cooking or at the table. 🍽️ Some processed meats, potato chips, and some cereals are very high in sodium. Many people simply add more salt to their food than is needed. 🧂

💊 Medical Recommendations

Because consuming sodium can elevate blood pressure, physicians often place hypertensive patients on low-sodium diets. 🩺 Although some people are more sensitive to the effects of sodium than others, 👥 the evidence is now clear that reducing dietary sodium lowers blood pressure in hypertensive and normal people alike. ✅

☕ Caffeine Effects

Another dietary substance that can affect blood pressure is caffeine. ☕ Most of people's caffeine intake comes from drinking caffeinated coffee, strong tea, and cola beverages. 🥤 Caffeine increases stress reactivity and raises blood pressure at least temporarily. 📈

🎗️ Diet and Cancer

Diets that are high in saturated fat and low in fiber are associated with the development of cancer, 🚨 particularly of the colon and prostate. Dietary fats are also linked to breast cancer. 💔

🥗 Prevention Through Diet

By following the guidelines of the Food Guide Pyramid—consuming little fatty meats and lots of fruits, vegetables, and high-fiber breads and cereals—people could reduce their risk of developing cancer. ✅ But only a few people follow these guidelines closely. 😔

🎯 Conclusion

What people include in their diets is clearly related to the risk they have of developing several major chronic diseases. 🏥 Making wise dietary choices and developing healthy eating habits early in life can have profound effects on long-term health and wellness. 💪🌟