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Nutrition plays a big part in sleep. More fruits and vegetables, legumes, grains, fish in the diet helps sleep by supplying melatonin. Increases supply of the essential amino acid tryptophan. This includes dairy foods. Tryptophan is a precursor of serotonin which converts into melatonin. This needs to be eaten with high fibre diet as a legume or  grain so it is digested properly. Lower inflammation levels improve sleep quality and plant based foods lower inflammation. High fibre helps as a healthy gut is beneficial for sleep. 

Consistent eating times, separation between day and night so that the biggest calories are taken earlier in the day with a good breakfast in the bright daylight hours, and the night meal taken early a few hours before sleep. This sends signals that the body is winding down to sleep and get the body ready to sleep.

LyrArc Article Gist
This essay from the Yale-Griffin Prevention Research Center which puts focus on preventive medicine looks at the food we eat in a different way. In order to have a real conversation on food it says ignore the latest fads on nutrition on keto, paleo or other diets, and think about how our ancestors ate in a healthy way that both prevented disease and provided the right nutrition. It was mostly plants as meat was not freely and easily available. So much so that the consumption of meat and animal protein may have gone up by as much as 90% today. Processed foods did not exist, and unprocessed plant foods were there in abundance. They were not called low fat low carb or vegan then. It is during the beginning of the 19th and in the 20th century that the production and marketing of shelf stable, nutrient poor, high calorie, high sugar and salt processed foods replaced the normal way our ancestors had their food leading to the public health crisis of today, both in health quality, outcomes and cost.  It says replace meat and where appropriate dairy healthier plant based beans, lentils, whole grains, and vegetables, fruits so that animal protein gets back to the levels of the centuries before the 20th century shift to processed foods. It says use common sense beans including soyabeans and lentil beans replace meat wherever possible and oats with berries and nuts replace eggs. Vegetable and garbanzo beans salad replaces cheese and yogurt reducing the cheese or yogurt to very moderate levels. Focus on wholesome food and eat like our ancestors did and exercize then everything else will fall into place. ...

LyrArc Article Gist
Obesity is a problem today of global dimensions. In the U.S. this problem has reached a new high and increased U.S. risks in the face of the coronavirus. This author and her nutrition organization say the U.S. dietary guidelines put out by a government agency have failed over decades to do what they were supposed to do - guide people in the right direction to make good food choices. People at this time of the coronavirus need to make their own choices, independent of these guidelines that have failed. Intuitive choices for healthy eating by increasing vegetables and fruits in the diet, increasing use of healthy herbs such as turmeric, basil and ginger, eating carbohydrates and fat in a sensible way, increasing ancient whole grains in the diet, reducing meat in the diet in favor of plant based foods such as lentils and a large variety of whole grains.