Christina El Moussa's nutritionist breaks down her diet

Instead, the mother of two stays committed to a food routine that works for her, designed by nutritionist, fellow mom and BFF Cara Clark. According to the California-based expert, the first task was increasing calories. 

"She's always been super active and she was like any typical client of mine that is very healthy aware. She was way undereating at that point when I met her," Clark told E! News exclusively, explaining that her food intake was not enough fuel to support her busy daily life.