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When starting a diet, it is hard to know what to eat to ward off hunger pangs.  Now scientists have revealed the foods which fill us up best, by sending signals to the brain that we have had enough to eat.

These are said to be the most satisfying foods. However, each people has its culinary behaviors

Chicken, mackerel, pork shoulder and beef stirloin steak are among the most filling foods, according to researchers at the University of Warwick.

Plums, apricots, avocados, lentils and almonds have the same hunger-busting effect.

People no longer feel hungry after eating these foods because of the amino acids they contain.

These amino acids, arginine and lysine, have been found to activate newly discovered brain cells called tanycytes which control the appetite.

Nicholas Dale, professor of neuroscience at the University of Warwick, said: ‘Amino acid levels in blood and brain following a meal are a very important signal that imparts the sensation of feeling full.

‘Finding that tanycytes, located at the centre of the brain region that controls body weight, directly sense amino acids has very significant implications for coming up with new ways to help people to control their body weight within healthy bounds.’

The brain’s role when dieting

Amino acids, found in protein-rich animal products, fruits, vegetables, grains, nuts and seeds, are already known to be the best nutrients for satisfying hunger and keeping us full for longer.

This is because protein is digested more slowly and does not cause the rise in blood sugar which makes us crave more food soon after finishing a meal.

However it is becoming increasingly apparent that the brain is also important in dieting. Amino acids’ effect on the brain would stop people feeling hungry even without any effect on the digestive system.

The key brain cells involved in curbing hunger pangs are revealed in the study led by the University of Warwick and published in the journal Molecular Metabolism.

These brain cells, called tanycytes, rapidly detected the two amino acids found in foods including avocados, almonds and chicken.

The amino acids, arginine and lysine, were quickly detected by brain cells made fluorescent to show their effect.

Within 30 seconds the cells reacted to the amino acids, sending chemical signals which would travel to the part of the brain controlling appetite and body weight.

Future diet pills? 

The findings raise the possibility of future diet pills which could suppress the appetite and help people lose weight.

However they also reveal the natural effect of amino acids in the foods we already eat, which also include aubergines, sweet potatoes, dates and figs.

The tanycytes pick up amino acids using the same receptors in our tastebuds which pick up their flavour. Amino acids have a ‘umami’ taste, which is the ‘fifth flavour’ found in many Japanese dishes as well as tomato juice, and tastes meaty and savoury.

When these receptors were blocked, the brain cells no longer reacted to the amino acids.

The study concludes: ‘It has become evident over the past few decades that the brain is a key player in energy homeostasis, and amino acids can have a satiating effect even when the digestive system is bypassed.’

 

Avocado is among the best fruits that provide people with mild fats

Daily Mail

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