We yawn when we’re tired? – Actually yawning has very little to do with someone being tired. Yawning is the result of breathing dysrhythmias that can occur any time of day. The body simply hasn’t caught up to speed with the current energy (oxygen requirements) output and as its demand for more oxygen increases, the body has to send these signals to the brain. So in short, the body is communicating to the brain that it needs more oxygen and the body’s ‘natural response’ to this dilemma is to yawn. A yawn is a deep inhalation of air, (usually involuntary) that fills the lungs with oxygen which contracts the diaphragm and forces out carbon dioxide.
Btw, yawning while you stretch is called pandiculation, (yes there is a name for that), and is usually experienced upon awakening and is almost always associated with being tired. Yawning has been proven to increase the heart rate by up to 30% and is very contagious, (there is no cure so it’s best to just yawn along). I bet you 10 to 1 that you yawned while reading this paragraph, (insert yawning emoticon here) ;-p
Does water make me feel full? – Since water has no calories – it won’t satisfy your body’s need for nourishment and the ‘full’ sensation you feel, if any, will be very short lived. When water or any beverage is being consumed it will occupy space in your stomach, therefore confusing your mind that you MAY BE full, however if you continue to attempt to trick your brain into believing it’s full based off of the consumption of water – you will only starve yourself which will eventually result in binge eating. Your brain will only suppress the sensation for hunger once its caloric needs are met. Keep in mind, once food or any liquid is consumed, it takes the brain approximately 20 minutes to receive these signals from the stomach, (mentioned in a previous article) and a lot of unnecessary eating can happen during that time. So as far as the consumption of food is concerned, experts suggest eating slowly so the brain can process the foods that are being digested more accurately – and to avoid over eating. Nobody likes the feeling of being ‘too full’ plus you’ll pay for it later with the additional fat deposits. So slow it down a bit – this is a school zone.
My hands and feet are cold because of poor blood circulation? – As long as you don’t have any medical complications that restrict the flow of blood to your hands or feet, they may be cold for the simple fact that these areas don’t have much muscle or fat. Very simply, MUSCLES GENERATE HEAT AND FAT RETAINS IT.
The same theory with a jacket – most people think that the jacket itself provides the warmth, IT DOES NOT, it simply retains the existing body heat and helps to block out the wind chill. (same principle as muscles vs fat theory). If you’re ever feeling cold while wearing a jacket and you can’t make it indoors – guess what, go for a quick jog or do some jumping jacks to heat up the blood, which in return will heat up your entire body. Your muscles will produce heat very quickly due to the rapid circulation of blood and the friction caused by the movement of the muscle fibers – this factored in with you wearing a jacket will get you feeling warm in no time. The areas of the body with less muscle will get less of a blood supply because the demand for more blood is not necessary and vice versa. Ever notice that your arms/legs don’t usually get as cold, if so, your hands/feet would be even colder and would have your attention even more – again, due to lack of muscle (and fat).
Unless you were experiencing frost bite, if your hands and feet weren’t getting adequate blood supply, they’d start to tingle, then eventually they’d get numb, and then they’d start to necrose, (turn black and putrid as if you had gangrene) and then you’d need to get them amputated. So don’t think that you have a disease or illness in the event you get cold hands/feet – it’s actually pretty normal, (just don’t shake my hand).