arty said:
High carbs are not good for you, since that would mean lots of calories. If you have high blood sugar, then you could have a problem, since carbs are converted to sugar - but so is everything.
No, this isn't true.
There are three forms of energy -- fat, protein and carbs. Carbs are long chains of sugar molecules that get broken up in your body starting with enzymes in your saliva.
Sugar gets transported rapidly to your bloodstream through your liver. It can be used for instant energy but basically it is stored either as glycogen, for short term storage in your liver and muscles, or if your glycogen stores are full, then it is converted into fat, transported as blood triglycerides and deposited into fat.
When protein or carbs are eaten, your body secretes insulin. Insulin tells every cell in your body that it is time to take up nutrients. Its opposite is glucagon, that tells every cell it is time to put out nutrients.
Insulin raises blood pressure and causes a host of other things. My knowledge is very simplistic on this whole thing of course.
Too many carbs are bad because they trigger insulin and they are stored as fat. People with heart problems, diabetes etc. often have high triglycerides and will especially benefit in reducing carbs. The idea would be to eat enough carbs to replace glycogen stores but no more. The average person has about 36 hours or so of glycogen stores in the body and at that point, the body switches more to using fat as energy. The body is now in a ketogenic state, where it burns fat for energy instead of sugar.
Dietary fat isn't converted into sugar, it is either used or stored as fat. Fat from animals we eat is usually fat the animals got from overeating carbs, for animals raised in typical factory farms. Wild meat of course is very lean.
Either way, fat doesn't raise insulin levels like carbs do.