Jack hit the floor and fired off push-ups until he thought he'd pass out. The spinning behind his eyes felt good. He'd gotten by with a half grapefruit (35 calories) at breakfast, because his mom was such an emotional wreck before driving him to the hospital. She didn't argue over the half cup of oatmeal (110 calories), which he dumped in the sink before polishing off the last of his red M&Ms, his go-to food when life got sucky.