What is The Ketogenic Diet?


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What is the Keto Diet?

by Top U.K. Nutritionist Rob Hobson

This diet is a more extreme version of low carb and continues to be popular amongst those trying to lose weight

The premise of this diet is that if you starve the body of glucose (which is the main source of energy for all the cells in your body) it will turn to an alternative source of fuel called ketones which are derived from fat

Glucose is stored in the liver and muscles as glycogen. When you eat very little carbohydrate, glucose is pulled from the liver and muscle is broken down temporarily to release glucoseAfter 3-4 days glucose stores become fully depleted at which point a hormone called insulin decreases and the body starts to utilise fat as its primary fuel. This fuel is in the form of ketones which are produced in the liver from fat

Initial weight loss on the keto diet is often more dramatic than a low-fat diet. Part of the reason for this is that glycogen in the muscles holds 3-4 times it weight as waterThis is also the reason why people feel particularly dehydrated when following this diet

As a side note, research shows that although the ketogenic diet has greater initial weight losses, overall the amount of weight lost is similar to that of a low-fat diet. It’s also a fact that diets rarely work and the greatest challenge is often how to keep the weight off once you start to eat normally again.

 

How do you follow the ketogenic diet?

In order for the body to reach ketosis, carbohydrates are limited to less than 50g per day which is mostly sourced from permitted fruits and vegetables, nuts and seeds. You may also be able to include a very small amount of foods such as oats as long as the total amount of carbohydrate falls within the limit required for ketosis to occur.  

The majority of food eaten on this diet is made up of fat which accounts for about 75% of your intake

 

What about vegan ketosis?

 

While the ketogenic diet is synonymous with plates full of high-fat foods such as meat, fatty fish, eggs and dairy products, there has been a growing trend for a plant-based approach to this way of eating. 

This diet does require quite a bit of thought and knowledge around how to create meals that meet the requirements which may put many people off.

Foods that need to be reduced or eliminated on a vegan ketogenic diet include:

  • Sugary foods: fruit juice, soft drinks, confectionary, puddings, sweets..
  • Grains and starches: rice, pasta, bread, cereals
  • Fruit: all fruit, except small portions of berries.
  • Legumes: peas, beans, pulses and lentils. 
  • Root vegetables and tubers: potatoes, sweet potatoes, carrots, parsnips, beetroot
  • Low-fat or diet products: often highly processed and often high in carbs.
  • Some condiments or sauces: mostly those high in sugar.
  • Alcohol: the high carb content can throw you out of ketosis.
  • Sugar-free diet foods: often high in sugar alcohols, which can affect ketone levels.

Foods to base the majority of your meals around on a vegan ketogenic diet include: 

  • Coconut products: Full-fat coconut milk, coconut cream, unsweetened coconut.
  • Oils: olive oil, nut oils, coconut oil, avocado oil. 
  • Nuts and seeds: all varieties including almond, Brazil, walnut, chia and pumpkin.
  • Nut and seed buttersall varieties including peanut, almond, cashew and sunflower.
  • Non-starchy vegetables: Brussels sprouts, zucchini, dark leafy greens, broccoli, cauliflower, peppers, mushrooms.
  • Vegan protein sources: full-fat tofu, tempeh.
  • Vegan full-fat “dairy”: coconut yogurt, vegan butter, cashew cheese, vegan cream cheese.
  • Avocados
  • Berries: blueberries, blackberries, raspberries and strawberries (in moderation). 
  • Condiments: fresh herbs, nutritional yeast, lemon juice, spices.

What does a typical day look like on a vegan ketogenic diet?

Breakfast: coconut milk yoghurt topped with nuts, seeds and toasted coconut shavings

Lunch: curry made with tofu, vegetables and coconut milk

Dinner: courgette noodles with nut pesto and vegan cheese

 

What about snacks on a vegan ketogenic diet?

Some people may need more calories outside of their mealtimesVegan ketogenic snacks include:

 

  • Guacamole and sliced red pepper
  • Dried coconut flakes 
  • Spiced nuts and seeds 
  • Sliced cucumber with vegan cream cheese 
  • Protein shake 

 

Is the vegan ketogenic diet healthy?

Given that the vegan diet is already restrictive, placing further limitations on the foods you can eat does run the risk of dietary imbalances.  

Many of the foods which are often bedrock to vegan meals such as grains, beans, pulses and lentils are not allowed on this dietThese foods are valuable sources of key nutrients including iron, calcium and zinc which may already be tricky for some people to get enough of in their vegan diet. On top of this, the restriction in food intake overall could leave some people short of valuable nutrients

Achieving a varied source of protein may also be hampered by this diet in the absence of foods such as beans, pulses and lentils.  

Shortfalls can be accommodated for by including fortified foods and supplements but this in itself may go against the vegan ethos of some people who want to take a natural ‘food only’ approach to the way they eat

 

What’s the verdict?

I can understand the attraction of this diet, especially given the hype surrounding it but I don’t think it’s the healthiest way for vegans to try and lose weightA healthier and more sustainable approach would be to put small changes in place which can be followed through long-termThis may include reducing portion sizes or creating meals based around plant foods high in protein and fibre such as bean, pulses, lentils and tofu which can help to keep you feeling full between meals.  

I’m also not a fan of any diet that shuns fruits and vegetables as eating a wide variety can help you to glean a huge array of valuable nutrients to support your overall health

If you do want to try this diet, then I would recommend you seek the advice of a dietitian or registered nutritionist to help plan your meals to ensure you’re getting everything your body needs to function properly and prevent any shortfalls in your nutrient intake

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