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.

Since nutrition facts are service that focuses on the best available balance of evidence,

we read lots of reviews of the available science.

So today we take a moment to review the reviews.

And our first story, the health effects of tea, coffee, milk, wine, and soda.

One phrase you'll hear repeatedly in my videos and books

is best available balance of evidence.

What does that mean?

When making decisions as life or death important as to what to best feed ourselves and our families,

it matters less what a single study says,

but rather what the totality of peer-reviewed science has to say.

To know if there's really a link between second-hand smoke and lung cancer,

it would be better to look at a review of or meta-analysis

that compiles multiple studies together.

The problem is that some reviews say one thing,

...