I'm Dr. Michael Greger and this is Nutrition Facts.

There's one thing we've been thinking a lot about lately,

and that's how to stay healthy in the middle of a global pandemic,

especially since we've learned that those with underlying health problems like obesity,

hypertension, diabetes, heart disease,

are more likely to have serious complications if they can track COVID-19.

So what do we do?

We try to stay healthy with evidence-based nutrition.

Today, the mighty power of our internal biological circadian clock,

did you know that the same meal, even at the wrong time of taking

double or blood sugars here are the facts?

We've known for more than a half century now that our glucose tolerance declines as the day goes on,

meaning the ability of your body to keep blood sugars under control.

If you hook yourself up to an IV and just drip sugar water into your vein and a steady pace throughout the day,

at about 8 p.m., your blood sugars start to go up,

even though you haven't eaten anything and the infusion rate didn't change.

The same amount of sugar is going into your system every minute,

but your ability to handle the deteriorates in the evening,

but bounces right back in the morning.

A meal eaten at 8 p.m. can cost twice the blood sugar,

as an identical meal eaten at 8 a.m.

It's as if you wait twice as much.

...