5 Modern Diets Dissected

The days of a weight loss plan simply involving calorie counting are long gone. The modern diet manipulates macronutrient consumption; it uses science (not always very accurately) to theorise over the best way to lose weight and it exerts its value by getting celebrity endorsements. Modern diets dissected today aim to improve overall health, promising benefits that go way beyond reducing your dress size.

So, what do these diets involve? Is the science sound, or is attempting to adhere to them going to do you more harm than good?

In this article, we take five of the latest fad diets and review them; we look at their strengths and weaknesses, and we break down what they really do.

  1. Ketogenic diet
  2. Paleolithic diet
  3. Alkaline diet
  4. Intermittent fasting
  5. Carb cycling

1. Ketogenic – ‘Keto’ – Diet

In recent years the Keto diet has garnered significant interest as a weight loss tool. A favourite of tabloid celebrities, ‘keto’ has become the latest buzzword in fitness and wellbeing networks. Its origins, however, are somewhat removed from this, with the ketogenic diet initially proposed as a means of managing treatment-resistant epilepsy. Considered to occur primarily as a result of metabolic dysfunction, sporadic seizures are not easy to manage. However, it has been shown that adopting a low-carbohydrate, high-fat, ketosis-inducing diet, stabilises brain excitability and reduces the frequency of sporadic seizures, as well as making the central nervous system more resistant to stresses and insults.

So, what is a Keto diet?

Adhering to a ketogenic diet involves putting one’s body into a state of nutritional ketosis. This means that instead of relying on glucose for energy, the body relies on ketone bodies, which are produced by the liver from stored fat when food intake is low, such as during fasting periods. As such, the body has a greater requirement for fat consumption via the diet. The Keto diet is low in carbohydrates, high in fat and moderate in protein content. The exact proportions of each macronutrient will vary person-to-person, but advocates of the diet recommend that just 5-10% of a person’s daily calorie intake comes from carbohydrates. This equates to 20-50 g a day.

1.1    What to eat

The Keto diet is renowned for being high in fats and those in favour of this diet are quick to highlight that the majority of fats can be obtained from unsaturated sources, in other words, the good fats, found in olives, avocados, nuts and seeds. It is certainly true that making sure your diet contains some of these is beneficial for overall health. However, too much fat can be detrimental, particularly when it is the saturated type found in lard, butter, coconut oil and palm oil amongst other sources. These staples can rapidly become an integral part of a ketogenic diet, as they are a simple means of boosting fat consumption. The danger of this is that saturated fats are known to increase cholesterol levels, which, in turn, can raise the risk of heart disease.

Protein is permitted, in moderation, but another issue with this diet is that it does not discriminate between types of protein. This means a lean, organic chicken breast is given the same nutrient weighting as an equal quantity of processed meat, such as pepperoni, which is rich in saturated fat.

Keeping carbohydrates to a minimum means restricting the amount of pasta, bread, oats and cereals that are consumed. Sugars, either refined or naturally occurring, such as those found in honey, are also avoided. Many fruits are rich in natural sugar, so most followers of this diet restrict their intake to a small portion of berries which have lower fructose content. Carbohydrate-containing vegetables, such as root vegetables, should also be avoided and replaced with non-starchy vegetables, including leafy greens (kale and spinach), broccoli and asparagus.

1.2    The positives

A 12 week study designed to investigate the proposed benefits of the keto diet when compared to a normal ‘mixed’ diet was performed on military personnel. Over the course of the study, participants saw a reduction in body mass and visceral fat, as well as a 48% improvement in insulin sensitivity. There was no reduction in their physical performance.

Other studies have shown improvements in the symptoms of metabolic syndrome and type 2 diabetes following adoption of a ketogenic diet. Dietary ketosis is associated with weight loss and improvements in HbA1C levels (one of the key markers of disease severity in patients with type 2 diabetes). This issue is that most studies to date have been done in animals or are of a very small scale. Thus, further work is needed to validate the proposed health benefits of the keto diet.

1.3    The negatives

Aside from the cardiac-based risks associated with a diet rich in fats, other problems associated with the keto diet are nutrient deficiency, constipation, increased stress on the liver and kidneys and heightened confusion and irritability, characterised as ‘brain fuzz’.

In addition, to continue to see the benefits from a dieting perspective, a state of ketosis must be maintained, which means low carbohydrates consistently.

2. Paleolithic – ‘Paleo’ – Diet

Considered to be the world’s most popular diet in 2013, and still highly favoured by celebrities and diet and lifestyle bloggers, the paleo diet has a simple concept; “if a caveman didn’t eat it, then neither should you.” Broadly speaking, it takes the diet of our hunter-gatherer (paleolithic) ancestors and applies that to modern day life.

2.1    What to eat

Included on the list of ‘good’ foods are meat, fish, eggs, seeds, nuts and healthy fats: with the emphasis being on good quality, organic (if possible) ingredients. Food that is prohibited includes refined sugar, flour, margarines, trans fats and anything processed. This includes pre-packaged food marketed as ‘diet’ or ‘low fat’. One of the most contentious points with this diet is the inclusion of dairy, legumes and grains in the list of foods to be avoided.

2.2    The positives

Adopting the paleo approach to eating and thinking, can be considered to be more of a healthy lifestyle change than an actual diet. If followed carefully, it is sustainable and the core message is strong; whole foods (unprocessed and unrefined) are good, processed foods are bad. It does not involve calorie counting, although people that adopt it generally consume fewer calories and find they get full sooner.

Whilst the diet in its purest sense does not include dairy, most participants today adapt it slightly for their needs and some may choose to include good quality, unprocessed, full fat milk.

Scientific studies looking at the Paleo diet are limited, but those conducted to date do show a tendency towards weight loss, improved glucose tolerance and reduced cardiovascular risk factors. This has led to the suggestion that this diet could be used in the management of metabolic disorders such as diabetes, reducing hypertension and improving insulin resistance. When this diet was compared to various other weight loss programmes, participants were found to have improved mental wellbeing and self esteem.

2.3    The negatives

Despite its widespread use over the past decade, this diet remains controversial amongst healthcare professionals. One of the major issues with the diet is that it is ‘over-hyped and under-researched’. Claims that it reduces the risk of autism, mental health issues and dementia, remain completely unfounded and require longer term, randomised and longitudinal studies. The scientific studies performed to date have typically only covered a short time period (up to 3 months) and they have very small participant numbers, making drawing significant conclusions difficult. The only long-term study, which looked at the paleo diet over a 24 month period, found very few differences between it and a diet that followed standard nutritional guidelines.

The diet is low in carbohydrates, which can make adhering to it a challenge for athletes who require that form of energy for optimal performance.

Staunch followers, who opt to cut dairy out of their diet completely, are likely to become calcium deficient, particularly if they do not increase their intake of leafy greens and nuts to compensate for the lack of dairy. In fact, some are getting less than 50% of their recommended daily intake, which will significantly increase their risk of developing osteoporosis.

Another drawback to this diet, is the financial aspect. With an emphasis on good, high quality ingredients, it has been suggested that the paleo diet is up to 10% more expensive than a standard diet.

3. Alkaline Diet

The basic principle of the alkaline diet is that our bodies function best at a pH that is slightly alkaline, 7.35-7.45. Therefore, by reducing our consumption of foods that create acidity, we are optimising the condition of our body.

3.1    What to eat

Vegetables are the major component of this diet. Organic produce is recommended and followers of the diet are advised to investigate the type (and pH level) of soil their food is grown in. Alkalising foods include Brussels sprouts, kale and sweet potatoes. Food that should be avoided include eggs, processed foods and refined sugars. Dairy is limited to yoghurt and kefir, as these have probiotic activity. Caffeine and alcohol should also be avoided.

3.2    The positives

When adopted in moderation, this diet actually encompasses good, old-fashioned, healthy eating. Reducing the intake of processed foods will naturally lower sodium and sugar consumption. Excessive salt raises blood pressure, increasing the risk of heart attack and stroke; excessive sugar increases the risk of tooth decay and can cause weight gain. Most diets agree that eating more fruit and vegetables and cutting back on free sugars (defined by the World Health Organisation as those sugars added to foods by the manufacturer, cook, or consumer, as well as those that are naturally present in honey, syrups, and fruit juices. Sugars found naturally in milk, fruit and vegetables are not free sugars) and alcohol consumption will improve your overall health. There is no calorie counting, so adhering to the alkaline diet is relatively straightforward once you know what food is and is not permitted.

The diet is said to lower inflammation, improve metabolism and reduce chronic pain. However, in the study that looked at chronic back pain, relief was only actually achieved when patients were given alkaline multimineral supplementation, suggesting that diet adaptations alone may be insufficient to have a physiological effect.

In the media, this diet is sometimes referred to as the Tom Brady diet. This may not mean a lot to those who are not from the USA, but Tom Brady is a sportsman who plays as a quarterback in American football. He attributes his long standing career (he is now in his 40s), in part, to his diet, which is essentially a version of the alkaline diet. Thus, advocates of this diet will claim that it can be a useful tool for athletes, enabling them to prolong their careers.

3.3    The negatives

The biggest problem with this diet is that it relies on information that is factually inaccurate. It claims that it will help to maintain a stable blood pH level; however, it is very unlikely that a change in diet will have a persistent effect on blood pH; there may be transient changes, but these will usually be rapidly regulated by the body’s own internal systems. The pH of the urine may alter because it is a waste product, but contrary to what some suggest, this is not indicative of what is happening in the blood. One thing that does require further study is the issue of whether continual bouts of short-term metabolic acidosis, which happens when the blood pH drops slightly due to excessive consumption of acid precursor foods, can impact a person’s overall health.

The alkaline diet is claimed to have anti-cancer properties as some studies have shown that cancer cells thrive in an acidic environment. It is proposed that by consuming alkalising foods, the conditions for cancer cell growth are made more inhospitable. However, these studies were limited to cancer cells grown in a petri dish and, as such, are not indicative of the growth of tumour cells in the complex multi-system human body.

Another misconception is in relation to the Acid-Ash hypothesis. This is an hypothesis adopted by followers of the alkaline diet, to support a role for the diet in protecting bone density. The theory is that consuming a diet rich in protein and grains, but low in potassium, causes metabolic acidosis. The Acid-Ash hypothesis states that this acid overload is counteracted by the release of salts, specifically calcium from the skeleton into the circulation, rendering a person at risk of developing osteoporosis. Advocates of the alkaline diet claim that fruit and vegetables provide a supply of organic molecules (sodium, potassium, calcium and magnesium) that can be metabolised to bicarbonate and thereby protect the skeleton from excessive calcium loss. In contrast, a diet rich in proteins and grains increases production of sulfate and phosphate, which can be detrimental to bone health. This hypothesis makes the assumption that excess urinary calcium correlates with a direct loss in skeletal calcium; however, there is no scientific evidence to support this. There is also no direct evidence that abiding by an alkaline diet will prevent calcium loss and protect bone density.

It is a pity that such sweeping generalisations and dubious science are used to promote this diet because in its most basic form, it is a good model to live by. Eating a diet low in processed foods and high in fruit and vegetables could benefit everyone.

4. Intermittent Fasting

Not so much a diet, as a change in eating habits; intermittent fasting is defined as periods of voluntary abstinence from food and drink. In abstaining from food, we consume fewer calories and, the positive effects of a reduced calorie intake, include weight loss and improved overall health. The theory behind intermittent fasting is that, as humans, we evolved in environments where food was sometimes scarce; thus, we already have the compensatory mechanisms in place to protect our physical and cognitive abilities when food reserves are low. There are many variants of the approach now, with the idea being that people can pick the style of fasting that best suits them:

  • Alternate day fasting (Eat-stop-eat). Complete fasting every other day (total intermittent energy restriction) OR 70% energy restriction (reduced calories) every other day (partial intermittent energy restriction).
  • Modified fasting (5:2 diet). Limited to 500 – 700 calories for 2 non-consecutive days every week.
  • Time-restricted feeding (16/8 method). Fasting for between 14 and 20 hours each day.

4.1    What to eat

One of the major benefits of this diet is that when not fasting, a normal diet can be consumed. This means that no food types are explicitly prohibited (or recommended). For those that attempt time restricted feeding, the same number of calories may be consumed daily, but the timing of meals is altered. Benefits will be seen if these changes make the diet more metabolically favourable. Those on a 5:2 type diet will, on average, see that their weekly calorie intake falls by approximately 25%, suggesting that on the 5 regular days, they are not excessively eating to compensate.

4.2    The positives

Intermittent fasting is one of the only modern diets where the pros seem to outweigh the cons. As a means of losing weight, it seems to work as well as traditional calorie counting diets. It regulates insulin resistance and helps to maintain glucose homeostasis. When calorie consumption is low or negligible, the body uses up its glycogen stores and starts to generate ketones for energy.

It has been suggested that intermittent fasting protects against metabolic conditions, such as diabetes and cardiovascular disease. Much of the work to date has involved animal studies, which for obvious reasons cannot be directly extrapolated to humans. However, these preliminary studies show that intermittent fasting increases the resistance of the brain and heart to stress; as well as slowing the progression of neuronal dysfunction in disease models of Alzheimer’s, Parkinson’s and Huntington’s. This highlights the need for further, longer-term human-based studies to see how these results correlate in true physiological conditions.

People that follow a modified fasting approach, such as the 5:2 diet generally report an overall improvement in mood, with a reduction in anger and tension and an increase in self-confidence. Compliance to the diet is generally high and these sorts of diets are thought to be easier for obese people to stick to than continuous energy restriction.

Intermittent fasting, performed correctly, is not harmful. Whichever regime is followed seems to result in some weight loss and the evidence to date suggests that it is an effective, non-pharmacological approach to improving overall health.

4.3    The negatives

Studies have yet to identify what the optimal fasting regime is, for example, how long to fast, whether to fast on consecutive days or not, whether to implement specific calorie restrictions or a total fast. Further, long term studies on humans are required, with the aim of determining whether the many benefits seen in animals are replicated in man.

Initial adaptation to fasting can be difficult. Some people experience bad moods, dizziness and fatigue as their bodies adjust to using ketones for energy. These effects should be short term.

There are a few groups of people for whom intermittent fasting is not appropriate. Those already taking antidiabetic medication should not fast as they will increase their risk of hypoglycaemia. Pregnant and breastfeeding women should also avoid fasting.

5. Carb Cycling

Ideal for those who enjoy carbohydrates too much to avoid them completely, carb cycling involves adjusting your intake on a daily, weekly, or monthly basis. Examples of each are given below:

  • Daily. Limit carbohydrate intake at breakfast time and eat normally for the remainder of the day.
  • Weekly. Two days of high carbohydrates, low fat; two days of moderate carbohydrates; three days of low carbohydrates, high fat. Protein intake remains consistent.
  • Monthly. Four weeks of low carbohydrates, followed by one week of ‘refeeding’ with a high carbohydrate diet.

5.1    What to eat

This diet is less about what you can eat and more about when you can eat it. Carbohydrates are permitted at predefined times. The important thing is to avoid unhealthy variants; those following the diet should ensure that during ‘high fat’ periods, the majority of their dietary fat consumption comes from unsaturated sources, such as fish, avocados, nuts and seeds. Avoiding saturated or trans fats, which are rich in hydrogenated products, will reduce the risk of high cholesterol levels. Carbohydrate intake should also be regulated; preferred sources are whole grains, vegetables, fruit and legumes. Refined carbohydrates, such as sugar-sweetened beverages, pastries and white bread are not recommended.

5.2    The positives

Those who alternate between periods of low carbs and periods of high carbs have the potential to benefit from both states. The flexibility and the lack of complete avoidance of any one macronutrient makes this diet easier to adhere to for some people, increasing the likelihood of long-term success. There is also a psychological benefit to not completely eliminating certain food types.

The benefits of a low carb diet include improving insulin sensitivity, lowering cholesterol levels and, therefore, reducing the risk of developing cardiovascular disease. A small study that looked at obese patients with type 2 diabetes who adopted a low carb diet for two weeks, not only saw improvements in blood glucose levels, but paticipants also lost weight due to reduced calorie intake. However, this was a very small scale study and further work is needed to validate this theory.

Using carbohydrates strategically means scheduling high carb intake around times when the body needs extra energy. Athletes use carb cycling to maximise their performance. They overload on carbs on the days they are training in order to replenish the muscles’ glycogen supply and prevent fatigue.

These positive indications are encouraging, but can daily fluctuations in carbohydrate consumption really make a difference? The somewhat surprising answer to this question is, possibly yes. Normal recommended guidelines stipulate that a diet comprising 55% carbohydrates, 30% fats and 15% proteins is ideal. A recent study, which only considered breakfast, compared this standard diet to a low carb, high fat diet (<10% carbohydrates, 85% fats). Lunch and dinner followed normal guidelines and was the same for both groups. The low carb, high fat group had lower blood sugar levels after eating and, over time, reported improved glycemic variability (less fluctuations in blood sugar levels). They were also reportedly less hungry as the day progressed, suggested that calorie intake throughout the day would be lower. Work such as this, could have a large impact on the health and wellbeing of patients with type 2 diabetes.

5.3    The negatives

It could be argued that this is not a diet as such and, following the recommendations precisely, will not guarantee weight loss. People do lose weight, but usually as a result of consuming fewer calories.

The theory behind the plan is good, but validated research is still lacking. The diet aims to exploit the benefits of a low carbohydrate eating plan, alongside intervals of carb loading, utilised to good effect by high performing athletes. It is still not clear what the optimum schedule is, or, in fact, if this will alter from person to person. There is also the possibility that this diet will only really benefit serious athletes and that alternative approaches are better for non-athletes.

It can take time to fine tune and individualise the diet and this can lead to confusion and low adherence rates for those who want a simple formula to follow.

Nabta Conclusion:

Over the years, the concept of what makes an ideal body shape has changed. One thing that has, however, remained consistent is a manipulation of one’s dietary consumption with a view to obtaining what they perceive to be the ideal body shape. The word diet, referring to the obtainment of regular nourishment from food and drink, has been in existence since the 13th Century; however, dieting as a concept and a means of losing weight was first proposed by Willliam Banting in 1863. He advocated a low carbohydrate, low calorie eating regime. His ideas are still available in print form today in his book entitled, “Letter on Corpulence”. It is quite telling that, over 150 years later, many modern diets still advocate the extensive benefits of reducing carbohydrate intake.

The list of diets in this article is far from exhaustive; there are many different types and variants. Some that function on a membership-type basis, where you sign up to a programme and, in return, receive recipes and other resources; others that exploit the principles of vegetarianism or veganism to promote healthy eating.

The purpose of this article is not to condemn all modern diets. As our scientific understanding of the human body and its interaction with macronutrients grows, we can, and should, adapt the way we eat to achieve a healthier lifestyle. The key is to carefully select which plan to follow; choose one which suits your lifestyle and try not to deprive yourself of everything that you enjoy, as this reduces your likelihood of adhering to the diet long-term and may cause unnecessary stress to your mind and body. Examine the proposed benefits of a particular diet and bear in mind that not everything you read will be completely accurate. Ensure that you are not consuming anything that could cause you harm or putting your health at risk by starving your body of vital nutrients.

Above all else, it is worth consulting a healthcare professional before implementing any dietary adjustments, particularly if you have an underlying medical condition.

Get yourself the energy and slim pack from Nabta.

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