There's been a lot of Obamacare news and data released since the law's successful 8 million member launch. This transformative law is revolutionizing American health care and dramatically shifting how health care is accessed and received.

All health care investors need to take note, but investors interested in major insurers like WellPoint (NYSE:ANTM)UnitedHealth Group (NYSE:UNH), and Aetna (NYSE:AET) in particular should be watching very closely to see what comes of the law.

Of course, sifting through all of that data can be incredibly difficult. But two huge trends have become very apparent.

Insurers are expanding their exchange footprints
UnitedHealth Group is the clearest example, with reports indicating that the company will at least double the number of Obamacare exchanges it participates in -- from five to 10 -- although not all of the data is out yet. WellPoint, which played very aggressively in the exchanges, has come out looking good so far for 2014, and it appears that UNH has decided to increase its competition. This is a major plus for consumers, as more competition may lead to cheaper prices and better plans. Speaking of which...

Health plan premiums have not spiraled out of control
In fact, they've been lower than the CBO projected. And in some states and some plans, premiums have even dropped (Healthy CT, a Connecticut-based insurer, is reportedly requesting an average 8.9% drop in its premiums).

In this video, from Market Checkup, the Motley Fool's health care-focused investing show, health care analysts Michael Douglass and David Williamson delve deeper into these trends and the data investors need to watch as we all work to understand the health care shifts that Obamacare is causing.

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David Williamson owns shares of UnitedHealth Group. Michael Douglass has no position in any stocks mentioned. The Motley Fool recommends UnitedHealth Group and WellPoint. The Motley Fool owns shares of WellPoint. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.