Why fast foods are bad, even in moderation

Eating a diet consisting largely of fast food could cause your waistline to bulge more than eating the same amount of fat from healthier sources.

Monkeys fed a diet rich in trans-fats – commonly found in fast foods – grew bigger bellies than those fed a diet rich in unsaturated fats, but containing the same overall number of calories. They also developed signs of insulin resistance, which is an early indicator of diabetes.

Trans-fats, or partially hydrogenated oils, are found in many fast foods and also in baked goods and processed snacks. They dramatically increase the risk of heart disease – even more than saturated fats found in animal products.

Kylie Kavanagh, at Wake Forest University Baptist Medical Center in Winston-Salem, North Carolina, US, wondered how this "killer fat" would affect the risk of diabetes in 51 vervet monkeys.

She fed one group of monkeys a diet where 8% of their daily calories came from trans-fats and another 27% came from other fats. This is comparable to people who eat a lot of fried food, says Kavanagh. A different group of monkeys was fed the same diet, but the trans-fats were substituted for mono-unsaturated fats, found in olive oil, for example.

Both groups ate the same total calories, which were carefully metered to be just enough for subsistence.

Path to diabetes

After six years on the diet, the trans-fat-fed monkeys had gained 7.2% of their body weight, compared to just 1.8% in the unsaturated group. CT scans also revealed that the trans-fat monkeys carried 30% more abdominal fat, which is risk factor for diabetes and heart disease.

"We were shocked. Despite all our enormous efforts to make sure they didn’t gain weight, they still did. And most of that weight ended up on their tummies," says Kavanagh, who presented her findings at the American Diabetes Association meeting in Washington DC, on Monday. "This is walking them straight down the path to diabetes."

This is the first study to show such a dramatic result on abdominal fat, adds Dariush Mozaffarian at the Harvard School of Public Health in Boston, US. "The days of thinking about fats just as calories are over," he says.

Partially hydrogenated oils can easily be replaced by other oils during food production. Last week, fast-food giant Wendy’s announced that it was cutting partially hydrogenated oils from its food in the US and Canada, while in January, food manufacturers in US were ordered to label all trans-fats on packaged goods.

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South Beach Diet

Definition

The South Beach diet is a three-phase, carbohydrate-restrictive diet. It emphasizes foods that are low on the glycemic index (GI) and low in saturated fat, such as lean meats, vegetables, cheeses, nuts, and eggs. Unlike other carbohydrate-restrictive diets, such as the Atkins and Zone diets, the South Beach diet promotes "good" carbohydrates, such as whole grains and fruit.

Origins

The creator of the South Beach diet, Dr. Arthur Agatston, is considered a leading cardiologist and is the director of the Mount Sinai Cardiac Prevention Center in Miami Beach. Originally, he had intended to design an eating plan to improve the cholesterol and insulin levels of his patients. However, Dr. Agatston soon discovered that his patients also lost weight on his plan. After further research, he approached Marie Almon, R.D., chief clinical dietician at the hospital, to help develop the eating plan into an effective diet. The results became the South Beach diet. Having sold more than a million copies since its publication in April 2003, The South Beach Diet book has remained on the New York Times bestseller list for over a year.

Benefits

The primary benefit of the South Beach diet is considered by many to be its initial rapid and significant weight loss—8–13 lb (4–6 kg) in the first two weeks. After the first two weeks, weight loss continues at a slower rate, averaging 1–2 lb (0.4–1 kg) weekly. In addition to weight loss, the diet reduces cholesterol and insulin levels, thus reducing the risks of diabetes and heart disease. It is claimed that the diet is easy to follow because it is designed to eliminate cravings and has more flexible food options after the first two weeks.

Description

In his book, The South Beach Diet, Dr. Agatston states that "this diet is not low-carb. Nor is it low-fat." Instead, the diet focuses on eating the "good" carbohydrates (fruits, vegetables, and whole grains) and "good" fats (olive oil and nuts) rather than eliminating them from the diet entirely.

Dr. Agatston based the core of his dietary plan around the glycemic index –the increase in blood sugar levels by foods containing carbohydrates during a set amount of time.

After consumption, food is metabolized into sugars and promotes the release of the hormone insulin. When the blood contains excess sugar, insulin removes it from the blood stream by storing it in cells, including fat cells. High-glycemic carbohydrates (greater than 70 GI) are metabolized rapidly, which causes elevated insulin production. High levels of insulin result in more blood sugar being stored as fat, thus causing weight gain. This pattern induces craving for more carbohydrates, thus leading to the consumption of more high-GI foods. Low to moderate-GI foods, however, raise insulin levels more slowly and sugars are metabolized more effectively, thus reducing the amount of blood sugar stored as fat. Cravings for more food is reduced. In addition, by eating these low-GI foods, the risk of insulin resistance that can lead to atherosclerosis and diabetes is reduced. As such, Dr. Agatston designed the South Beach diet to promote foods low on the GI and eliminate the body’s craving for high-GI foods.

The South Beach diet consists of three phases. Phase one is the strictest part of the diet and lasts for two weeks. The purpose of Phase one is to banish the dieter’s cravings for high-GI foods such as bread, rice, potatoes, pasta, and sugar. Alcohol, fruits, cereal, and such vegetables as carrots and corn are also restricted during Phase one. Instead, protein-rich foods are emphasized, such as lean meat, fish, eggs, cheese, nuts, and vegetables. Coffee and tea are also allowed. Three regular-sized meals are eaten each day, supplemented by mid-morning and mid-afternoon snacks as well as dessert. During this period, the body chemistry will change dramatically until cravings for high-GI foods are eliminated and insulin resistance is improved/lowered. In addition, rapid weight loss is typically experienced.

Phase two reintroduces several of the restricted foods and encourages eating from all the dietary food groups, the expected result being that the body will neither crave high-GI foods nor store food as excess fat to the same degree. Such high-fiber carbohydrates as whole-wheat pasta and bread and most fruits are now permitted. Moderation remains the key to success for this phase and low-GI foods are strongly encouraged. Phase two continues until the dieter reaches his or her ideal weight, ideally averaging a loss of one to two pounds per week.

Phase three, the ultimate goal, focuses solely on weight maintenance. Having reached the ideal weight, the dieter now makes the changed eating habits a lifestyle from this point forward. Basic dietary techniques are still maintained. Only the high-GI foods and "bad" fats from the previous two phases continue to be restricted. Altered body chemistry will promote long-term cardiovascular health and reduce the risk of diabetes. Should weight gain occur, Phase one of South Beach diet is reintroduced until the weight goal is achieved.

Preparations

There are no initial preparations required for the South Beach diet. However, as with most diets, it is wise to consult with a physician beforehand. Blood testing for insulin, glucose, and cholesterol levels is suggested. It is strongly recommended that dieters taking medications for medical conditions such as heart disease consult a physician before going on the South Beach diet. Similarly, diabetics on insulin or other medications are advised to have a doctor monitor their blood sugar regularly and determine if they are at risk of kidney impairment while on the diet. It is also recommended that a registered dietitian be consulted to determine the dietary needs of certain medical conditions, such as pregnancy.

Precautions

The South Beach diet is not recommended for people suffering from or at risk of kidney problems. The diet’s high protein content can place increased strain on the kidneys, possibly causing long-term damage as well as kidney stones and bone loss. Additionally, the possibility of ketosis-induced dehydration during Phase one can increase the risk of further kidney impairment. Dehydration occurs when the body experiences water loss with accompanying loss of important blood salts like potassium and sodium. Ketosis occurs when carbohydrates are not available and the body burns an excessive amount of fat, during which some ketones, or fat fragments, are excreted. The restrictive nature of Phase one may also induce mineral and vitamin deficiencies. Remaining in Phase one of the diet for longer than two weeks greatly increases the risk of losing bone and muscle mass. Dieters should remain in Phase one for no longer than three or four weeks.

Some nutrition professionals contend that the South Beach diet menus provided in the book lack important nutritional information and detailed portion sizes as well as specific substitutes for foods the dieter cannot or will not eat. They claim that these aspects, combined with the restrictive nature of the diet, can make sticking with the South Beach diet on a long-term basis difficult for some people. Also, they assert that the diet does not emphasize an exercise regimen and that exercise is vitally important to avoid the loss of muscle and bone mass, especially during Phase one of the diet.

Side Effects

Despite Dr. Agatston’s claims to the contrary, the South Beach diet is both a low carbohydrate and a low fat diet. For this reason, one main concern regarding the diet is the risk of ketosis, especially during Phase one. Ketosis can cause such symptoms as dehydration, dizziness, heart palpitations, fatigue, lightheadedness, and irritability. Hypoglycemia, low blood sugar, headaches, and excessive fluid loss are also commonly associated with this diet. Cramping and tired muscles can be incited by salt depletion. Kidney functions can be impaired, possibly leading to serious health issues. Kidney function can be further impaired by the diet’s high protein requirements. These side effects typically lessen or fade at the beginning of Phase two, when a more balanced diet is undertaken.

Research & General Acceptance

Unlike the majority of low-carbohydrate diets, the medical community generally accepts the South Beach diet. The South Beach diet contains all the major food groups, promotes ingestion of "good" fats for maintaining heart health, and is flexible enough to accommodate most dietary needs.

However, many clinicians and dietitians agree that the rapid initial weight loss results mostly from water loss. Much of this weight can return once the dieter rehydrates.

Another important criticism by medical and nutritional professionals is the lack of evidence to support Dr. Agatston’s claims connecting the consumption of low-GI foods and weight loss. They assert that as of the early 2000s, there is no scientific proof that eating low-GI foods will have any more weight loss effect than eating a normal, calorie-reduced diet that includes carbohydrates; that Dr. Agatston also fails to take into account the interaction of different foods when eaten together, which can dramatically alter glucose metabolism; and that this failure means that utilizing the Glycemic Index as a gauge for what foods to eat is not only confusing but also slightly misleading.

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Guide To Body Fat (Adipose Tissue)

Body Fat Explained

What Is The Purpose Of Storing Body Fat?

Storage of fat on the body is a critical defence mechanism. Remember, the human body has not changed essentially since the Stone Age. At that time starvation and famine were ever-present dangers to survival, while over-consumption and obesity were unheard of. To enable Stone Age humans to survive periods of food scarcity, the human body was designed to store energy which could then be drawn upon in times of famine. Thus for example, people could overeat during the hunting season, or when food was plentiful, and the surplus would be stored as fat tissue (adipose tissue). And when food was short, the body would burn the deposite fat as energy. Of course Stone Age life and body chemistry was/is much more complicated than this simple explanation suggests, but it suffices to explain why we have a built-in fat storage facility.

How Are Carbs, Protein And Fat Absorbed And Stored?

The human body needs energy to power muscles and to fuel the millions of chemical and biological reactions which take place throughout our system every day. This energy comes from the food we consume in our diet. Food consists mainly of water and three types of nutrient – protein, dietary fats and carbohydrate – which are found in varying proportions in most foods. These nutrients are broken down, digested and absorbed by the body in the gastrointestinal tract, running from the mouth to the anus. Each of these macronutrients is processed and absorbed by the digestive system in different ways.

How Are Surplus Carbs Used And Stored?

Carbohydrate is the major source of energy for the body. This is because, of all nutrients, it converts most readily to glucose which is the body’s preferred fuel. When we eat carbohydrate, it is converted to glucose in the digestive tract and distributed via the liver to cells throughout the body for use as energy. Once our immediate energy needs are satisfied, the remaining carb glucose is handled in one of two ways. Either it is converted to liquid glycogen (a temporary source of readily available energy) and stored in the liver or muscles. Or, it is converted into fatty acids by the liver and stored in adipose cells (fat-cells) around the body.

How Is Surplus Protein Used And Stored?

Protein is broken down into amino acids in the stomach and small intestine, then distributed via the liver to cells throughout the body for a variety of uses included cell formation and repair. Some surplus protein amino acids are kept circulating in the bloodstream, the remainder is either converted into a type of simple sugar and used as energy, or (like carbohydrate) is converted to fatty acid and stored in adipose cells.

How Is Surplus Dietary Fat Used And Stored?

Dietary fat is broken down into fatty acids and glycerol by the stomach and small intestine. It is then distributed (in the form of triglycerides) via the lymphatic system and bloodstream to the cells for a variety of specialized uses or, in the absence of sufficient carbs, for energy. However, since dietary fat cannot be converted into protein and only about 5 percent (the glycerol part) is convertible into glucose, and because dietary fat is not the body’s preferred choice of fuel, a significant amount ends up being stored as body fat in the adipose tissue.

Conversion Of Body Fat To Energy

If energy is required suddenly, the body first uses up its glycogen reserves. After this, it converts the body fat in the adipose cells into energy by a catabolic process called lipolysis. During lipolysis, triglycerides within the adipose cells are acted upon by a complex enzyme called hormone sensitive lipase (HSL). This converts the triglyceride into fatty acids and glycerol. The fatty acids are then transported via the bloodstream to tissues for use as energy, or (along with the glycerol) taken to the liver for further processing.

Adipose Tissue

Adipose cells which make up adipose tissue are specialized cells which contain and can synthesize globules of fat. This fat either comes from the dietary fat we eat or is made by the body from surplus carbohydrate or protein in our diet. Adipose tissue is mainly located just under the skin, although adipose deposits are also found between the muscles, in the abdomen, and around the heart and other organs. The location of fat deposits is largely determined by genetic inheritance. Thus it is not possible to affect where we store fat. Nor is it possible to influence from which area the body burns fat for energy purposes.

Why Do We Get Fat?

Most of us develop body fat because we eat more calories than we burn in exercise. Given a culture which emphasises "value for money food portions" and "super-sizing", along with an steady increase in serving size, an upsurge of new tasty high-calorie foods and energy drinks, such over-consumption is perhaps only to be expected. Lack of exercise is also a major contributory factor. However, overeating and lack of fitness is not the whole story.

Why Are So Many People Obese?

The prevalence and incidence of obesity (the disease of excess body fat) has risen considerably over the past 25 years, both in the developed and undeveloped world. Why is this? We don’t know for sure. Despite extensive research into the causes and predictors of obesity, they remain unquantified. In other words, although we know that (eg) excessive calorie intake, lack of exercise, metabolic disorders and genetic inheritance all impact on the incidence and symptoms of obesity, experts still don’t know the relative contribution of these causal factors. The only thing that most experts agree on, is that the recent upsurge in obesity cannot be attributed in any major way to the influence of genes, since genetic changes typically take millennia to appear, not two decades. Even so, the connections between type 2 diabetes, raised blood fats, obesity and insulin insensitivity – a cluster of symptoms which form the condition known as insulin resistance syndrome – is evidence of a progressive deterioration in the body’s metabolic efficiency, which may be a growing underlying factor in the development of excess body fat among many people.

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How Do You Reduce A Fat Belly?

Is a Fat Stomach Unhealthy?

Yes. For people with a BMI of 34 or less, a fat belly is regarded as an additional health risk. Fatty tissue which is stored around the stomach and abdomen (sometimes called intra-abdominal, or visceral fat) carries a greater health risk than fat located in the lower body around the butt and thighs. Some health studies show that abdominal fat leads to raised blood pressure, high cholesterol levels, high blood sugar, insulin resistance syndrome (metabolic syndrome X) and heart disease. Because of this, some experts believe that waist circumference and fat-distribution is more important than your actual weight in predicting future health risks.

What Causes a Fat Belly?

Where we store fat (surplus calories) is largely a combination of gender, age and genetic inheritance. Men tend to store fat around their middle (apple shape), whereas women typically store fat around the pelvic region, hips, butt and thighs (pear shape). However, women are prone to develop an apple shape in mid-life, after menopause. This is because the female hormones are present in smaller amounts and so their shape tends to become more ‘male’.

NOTE: To understand how surplus food calories from carbohydrate, fat or protein are converted to body fat and stored in adipose tissue cells, see How We Gain Body Fat (Adipose Tissue)

Stress and Stomach Fat

Some health studies show that abdominal fat can develop as a result of stress. This is because the hormone cortisol is released during stress, and a high level of cortisol in the body appears to stimulate the storage of fat around the belly and abdomen. Researchers at Yale University studied 60 women and found that the more stress they were under, the more fat they stored around their stomachs. So it appears that a fat belly is most likely to develop in stressed men of any age, and older stressed women.

How to Prevent a Fat Belly?

If you are prone to store fat around your middle, the healthiest solution is to maintain a normal weight. By matching your calorie intake to your calorie needs and prevent weight gain, you will prevent the development of any excess fat.

How to Reduce a Fat Stomach?

However, if you already have a fat belly, the best option is to follow a healthy weight loss diet, combined with fitness exercises such as aerobics (to burn extra calories) and a stomach-toning workout to help tighten and strengthen abdominal muscles. That said, reducing a fat stomach takes time – especially if you are an apple-shape. Despite what commercials say, there is no diet-plan or type of exercise that can "target" your fat stomach. So please don’t get impatient. Your fat belly will disappear, I promise.

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Is Insulin Resistance and Cortisol Giving You a Fat Belly?

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Atkins Diet Basics

The Atkins diet is not a new phenomenon. The diet first appeared in the late 1970s and has grown popularity in recent years in response to the low-fat diet craze. As dieters had trouble with low-fat plans, they searched for a new solution and Dr. Atkins’ New Diet Revolution book found a new audience.

A lot of people have jumped on the Atkins bandwagon and there has been a lot of hype as a result. But what are the basic principles of the Atkins diet?

The Atkins diet is based on a theory of why we get fat. According to Dr. Atkins, the over-consumption of carbohydrates and simple sugars leads to weight gain. The way your body processes the carbohydrates you eat have more to do with your waistline than the amount of fat or calories that you consume. In his book, Atkins outlines a phenomenon called “insulin resistance.” He theorizes that many overweight people have cells that do not work correctly.

When you eat excess carbohydrates and sugar, your body notices that sugar levels are elevated. Insulin is released from the pancreas in order to store sugar as glycogen in the liver and muscle cells for extra energy later on. However, your body can only store so much glycogen at once. As soon as your body reaches its limit for glycogen storage, the excess carbohydrates are stored as fat. This happens to everyone who eats too many carbohydrates.

However, insulin resistant individuals have an even harder time of using and storing excess carbohydrates. The more insulin that your body is exposed to, the more resistant it becomes. Overtime, the pancreas releases more insulin and cells become insulin resistant. The cells are trying to protect themselves from the toxic effects of high insulin. They create less glycogen and more fat.

As a result, insulin resistant individuals gain extra weight. The carbohydrates get converted into fat instead of energy. Other side effects include fatigue, brain “fog” (the inability to focus, poor memory, loss of creativity), low blood sugar (which can leads to hypoglycemia), intestinal bloating, sleepiness, depression and increased blood sugar. There is much more than weight at stake when you are insulin resistant.

The remedy for people who are insulin resistant is a diet restricted in carbohydrates. The crux of the Atkins diet is a limitation of carbohydrates in all of its forms. The foods restricted on the Atkins plan include simple sugars (like cookies, sodas and sweets) and complex carbohydrates (like bread, rice and grains). Even carbohydrates that are considered healthy, such as oatmeal, brown rice and whole wheat bread, are restricted on the program.

The diet has you restrict your carbohydrate intake to less than 40 grams a day. This will put your body in a state of ketosis. While in ketosis, your body will burn fat as fuel. According to Dr. Atkins’ research, the ketosis state will also affect insulin production and it will prevent more fat from being formed. Your body will begin using your stored fat as an efficient form of fuel, and you’ll lose weight.
Another benefit of the Atkins plan is that ketosis will end your cravings for carbohydrates. If you’ve been living on a carb-heavy diet, you may have found that you simply cannot get enough carbohydrates. With carbohydrate restriction and ketosis comes a reduction in carbohydrate cravings. People who have been on the Atkins diet for some time report that they do not crave carbohydrates as they once did.

Although the initial phases of the Atkins diet are rather strict, the program teaches you to restore balance to your diet in the long run. People who use the diet slowly reintroduce minimal amounts of carbohydrate into their eating until they find a comfortable balance between their health and carbohydrate use.

The basic principles of the Atkins diet have been adapted to many other low-carb diet plans. However, Atkins popularity still remains strong as one of the most effective low-carbohydrate solutions for those who are insulin resistant.
 

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