In science knowledge, after rice go inside our stomach so will be produced L-Tryptophan, namely amino acid which became formation of bed material niacin, own vitamin B. Niacin will be used to make serotonin, nutrient sender signal in brain that could be generating pleasant feeling and cause us sleepiness. Food that is rich carbohydrate such as rice, will stimulate pancreas to generate insulin , that will keep food in body.
Other a few tamarind amino that earlier contained in together blood with L-Tryptophan, will enter into muscle cell. Therefore, will happen increase in relative concentration L-Tryptophan in blood and serotonin that formed make us sleepy. That reason him why reason him after eating heavy usually we will sleepy and want sleep.
Need to be reminded, fruit is food substance which contains fructose that can raise increase of rate insulin. And for that, eat fruit organized before eat rice because to prevent hard labour from pankeras produce insulin.
If eat first rice, pancreas will work weight to process rice and protein that there is in dishes and need time hours. And if fruit eaten after eating rice, so fruit which already inside stomach will take long time to pass process digestion and the nutrient will damage first before managed to be digested.
We are surely ever looked at apple which already are taken apart then too long being kept so gradually will be yellow and can putrefy. That just only affected air not been mixed yet with food in our stomach? Certainly fruit will putrefy before managed to be processed. EAT THE NEED NOT PURPOSE. EAT BY ACCORDING TO RIGHT METHODOLOGY WILL GUARANTEE OUR HEALTH!