Ghrelin – the hunger hormone in a nutshell

Ghrelin is produced by ghrelin cells which are found in the stomach, lungs, pancreas and kidneys. It is a hormone that regulates hunger. When the stomach is empty, ghrelin is released. When food is eaten ghrelin secretion stops. Ghrelin increases appetite, increases food intake and promotes fat storage.
Ghrelin also promotes the release of growth hormone from the pituitary gland which breaks down fat tissue and helps building muscle tissue.
When people go on ‘yo yo’ diets – extreme calorie cutting diets, the weight they lose during dieting comes back on quick when the diet stops. One of the reasons why this happens is because the ghrelin levels are dramatically increased. The hormone levels stay like that for some time after the diet has stopped. The body reacts as if it went through starvation – which effectively it did, and to protect itself from future starvation it produces more ghrelin. In layman terms: you go on an extremely low calorie diet to lose weight. Your ghrelin levels increase so you feel more and more hungry. You are effectively starving on the diet to lose weight, and when you finally stop the diet, the body – to protect itself from further starvation – produces more ghrelin. Because you stopped the diet you go back eating normal and because you feel hungry you eat more and more – hence you put more weight back than what you’ve lost.
Ghrelin levels are primarily regulated by food intake. Levels of ghrelin increase when fasting (with increased hunger) and are lower in people with higher bodyweight than in lean people.
The different nutrients effect differently the release of ghrelin: protein and carbs slow down the production of ghrelin to a greater extent than fats – eating protein and carbs will make you feel fuller.

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A calorie is NOT a calorie – Part 1

I would like to talk about the calories here, because a lot of people think that all calories are equal.
For example let’s look at the difference between glucose and fructose. They’re both simple sugars and they both have the same amount of calories, but glucose can be metabolised by all the body’s tissues, while fructose can only be metabolised by the liver.
Fructose can be found in fruits and vegetables, but it is also manufactured in a lab.
Glucose is also called grape sugar or blood sugar and can be found in all major carbohydrates like starch or table sugar. They are both good sources of energy but excess glucose can be fatal to diabetic patients and excess fructose can lead to insulin resistance or non alcoholic liver disease.
Most fat gained from excessive glucose is subcutaneous (under the skin) and is not linked to diabetes or heart disease.
Fructose leads to higher ghrelin levels than glucose. Why it is important you may ask? Because ghrelin is the hormone that’s responsible for your hunger. Glucose decreases food intake.
High fructose sweeteners, soft drinks and corn syrup cause a rise in obesity. High fructose diet (too much sweeteners) promotes insulin intolerance which will cause abdominal fat gain and increased triglyceride.
So a calorie is NOT a calorie here, there’s a difference.

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About fat loss and supplements

Let me spare some thoughts on weight loss and supplements. I’ve heard this several times: I want to lose weight,I can’t take supplements. It depends on what supplements we are talking about. Whey protein? Well I believe that you can get away with not taking whey protein. If your main goal is to lose bodyfat then I would say try and stick to real, clean food. Why? Because the main aim of any whey protein is to get digested and absorbed quickly and easily. You see where I’m going with this? If it is easily digested then the body don’t need to put effort into digesting it = it won’t use much energy (calories) to digest it. However when you eat clean food – ie chicken, tuna, turkey etc – your body will burn more energy by just simply digesting the food. So I would say if you need to lose a lot of weight you can stay away from whey protein. Where will you get your protein from you may ask? First of all from your food – that should be the main source. Clean food: eggs, chicken, tuna, fish, red meat, turkey etc The second most important source should be amino acids.
Amino acids are the building blocks for protein. There are 20-22 standard amino acids, 8-10 of which are considered essential. That means you need to supplement these because your body cannot synthesize them. There are around 14 non-essential amino acids and a lot of other metabolites that are derived from these 8 essential amino acids.
Amino acids can be used for energy. When they’re used for energy, they cannot be used for building tissue and performing their other metabolic functions. Ladies, you don’t need to put on too much muscle, but you still need to understand that the more muscles you have the higher your metabolism is, which means you burn more energy even when resting. So some muscles will not only look good on you but will increase your metabolism which also means you will need to eat more, too. Quite handy, isn’t it?
During starvation the body releases amino acids from muscle issue to be used for energy. This also occurs during exercise and when the body runs out of carbs fuel from the diet or from glycogen stored in the muscles and liver. Unless proteins are present in the diet aminos are released, even if the body has fat for fuel.
BCAAs (branched chain amino acids) are used by muscles to supply a limited amount of energy during strenuous exercise. These are isoleucine, valine and leucine. Leucine is depleted the most frequently. Trained person’s muscles use up some amounts of leucine even at rest. Complete proteins are proteins that contain the essential amino acids in amounts that are sufficient for maintenance. Incomplete proteins are usually deficient in one or more of the essential amino acids.
So my advice: regardless of your aim in training (losing weight or putting on muscle) supplementing with amino acids and BCAAs is essential.

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About the different diets: Keto, Atkins and Paleo

Women in the locker room constantly keep asking me for diet tips, telling me what they do and what they heard they should do. They’re doing different diets, mostly fad diets. I believe that once you change your lifestyle and eating habits for the better and you start seeing results, you will never look back. However unfortunately many women seem to think that they can have a ‘quick fix’ to lose some weight by a crash diet and then go back to ‘normal’ which unfortunately causes all the weight and fat to come back, too.
In the following few days I will sum up some of the most popular diets, which could be a basis of how you change your eating habits.

The Ketogenic (keto) diet:

This diet is high in fats, low in carbs and moderate in protein. This diet causes the body’s metabolism to shift from glucose to fat utilisation. Ketones are produced by the liver. This diet can improve several health conditions, like Parkinson’s, Alzheimer’s, epilepsy and even cancer because healthy cells can use fats for energy, however cancer cells cannot so they starve to death. When you eat high carb foods your body produces glucose and insulin. Insulin is responsible to down regulate the glucose levels in the blood stream. Insulin is also responsible for storing fat in the body. If you produce too much insulin, you put on weight – simple.
There are different types of keto diets:

  • standard keto diet: you eat 20-50 gr of net carbs / day This is the same as the induction phase of Atkins diet.
  • Targeted keto diet: you eat carbs 30-60 mins before exercise. This is an old approach however you can give it a go because not everyone is the same and what works for one might not work for others and vice versa. But just for the records: you don’t need carbs before your workout.
  • Targeted keto diet alternative with no extra carbs: the idea of this approach is that your body may not need extra carbs before exercise to perform well. Again, you need to try this approach to see how you feel on it.
  • Cycling keto diet: what many bodybuilders use. You alternate keto dieting with high carb days – effectively you do carb loading. Use about 50 gr of carbs on the keto days and 300-600 gr on the high days – obviously depending on your needs and bodytypes. This is only for professional and high performing athletes, not for people wanting to lose a bit of weight.

 The Atkins diet:

The idea is that when you cut back on carbs your body turns to your fat stores for fuel. The result is that you burn body fat and your body releases a by-product called ketones that your body will use for energy.

This diet starts off as a keto diet in the induction phase. You drastically reduce your carb intake down to 20 gr, you cut out pasta, bread, potato or any starchy carb and dairy, and you only eat certain vegetables (fibres). No alcohol, no caffeine, no nuts, seeds or legumes.

After this comes the ‘ongoing weight loss’ phase when you add back slowly more vegetables, nuts, seeds, legumes, berries and other fruits and eventually wholegrains.

Then comes the phase when you might be able to add more carbs and foods back into your diet depending on your body’s needs.

Because of the food limitations in this diet, especially at the beginning, you will need to supplement vitamins especially potassium, magnesium and calcium.

The paleo diet:

This diet is based on our ancestors’ diets. Back in the days humans were hunters/gatherers. Then became farmers. So instead of loading up on meat, vegetables and seasonable fruits, we eat bread, pasta and grains. Back in the days grains were not part of our diet. Grains are composed of carbs and turned into glucose to be used for energy. Any glucose that isn’t used for energy will turn to fat. Our modern diet is full with refined food, trans fat and sugar which leads to diseases like: obesity, cancer, heart disease, diabetes, Parkinson’s, Alzheimer’s etc. There is a big difference between the fat content and quality of our modern grain fed animals vs grass fed wild animals. Wild meat is remarkably lean, and has relatively low amounts of saturated fats, while supplying significant amount of beneficial Omega-3 fats.

The foods that are OK to eat on a paleo diet are:

  • Grass fed lean meat, fowl (chicken, turkey, hen, duck, anything with wings), wild fish (not farmed fish), eggs, vegetables (not deep fried), oils (olive, coconut, avocado), fruits, nuts and seeds, tubers (sweet potato, yams)

If you stick to the foods you are allowed to eat on this diet you should not get fat because these foods are very nutrient densed foods so it’s almost impossible to overeat.

The foods that you need to avoid on a paleo diet are:

  • Dairy, grains, processed food & sugar, legumes, starches, alcohol

 The health benefits of paleo:

  • more efficient workouts,
  • stable blood sugar,
  • burn off stored fat,
  • reduce allergies,
  • balanced energy throughout the day,
  • anti-inflammatory,
  • better skin and teeth,
  • improved sleep patterns