And tThere was not enough information about health.

But tThese days, it has changed a lot.

If you want to use conjunctions, you need to use them to connect clauses. For example, your past three sentences could read: "Being healthy was just not being sick, and there was not enough information about health, but, these days, it has changed a lot." 'And' and 'but' don't go at the beginning of sentences.

Firstor example, people can easily get information about health on the internet.

Use 'first' only if you've previously established that you're going to elaborate a list of reasons. For example: "There are many reasons why this has changed recently. First, ..."

We know what food is good for the body and what we should do to stay healthy..

Next, pPeople try talso check up on their body on a regular basis.

With thea regular check-up, they can understand the current state of their bodies and what they need to do.

LastlyFurthermore, these days, many people try to work out as often as they can.

The gGyms also provide many training programs likthat feature yoga, Ppilates, cross fit and so on.

Once againverall, people are more conscious about their health these days.