The thing about blood sugar levels, is that unless you are diabetic, they don't actually vary much at all
It's basically a myth.
As a type 2 diabetic, this is something I know a lot about
And it's interesting just how wrong popular beliefs are.
Your body regulates blood glucose levels, if they're low the liver releases glucose into your blood stream, if you eat too much it's removed and concerted to storage fats.
.so normal people don't actually get low blood sugar.
If you eat a half pound of carbs in one go, then yeah you'll get a temporary spike while the excess is removed.
But most people on normal diets just won't get noticeable fluctuations in their blood glucose levels.
Refined sugar isn't actually as bad for you as things with very simple starches like bread and pototoes and rice.
All three of which have higher glycemic indexes than sucrose.
The glycemic index is a measure if how quickly a carbohydrate us converted into blood glucose.
So foods with a low GI are less likely to cause blood glucose spikes.
Periods of tiredness are far more likely to be due to things like mineral and vitamin deficiencies.
So don't give up chocolate, just eat less
And space it throughout the day rather than eating a whole bar in one go.
Caffeine Is an interesting one.
Apparently the latest studies claim that people who drink three cups of coffee a day live longer than people who don't.
Now whether it's down to the caffeine or the flavanoids and other trace elements in coffee or the caffeine, is anyone's guess
But nobody's said the same thing about tea,
So who knows.
The other interesting thing is that excesduve amounts of blood glucose actually makes you tired.
Makes little sense, but it is a fact nevertheless.
Human metabolism is a strange and often frustrating thing
Good luck with yours