RxBar co-founder Peter Rahal at his new multimillion-dollar Miami Beach home. Photography by Rose Marie Cromwell

What Really Happens When You Become an Overnight Millionaire?

Peter Rahal started RxBar out of his mom’s kitchen — then sold it for $600 million. Here’s life on the other side of the entrepreneurial fantasy.

PPeter Rahal, the 33-year-old energy bar impresario who sold RxBar to Kellogg for $600 million and became something of a…