The 28-year-old country singer sparked concerns for her health after being snapped in a bikini during her honeymoon in Mexico with husband Eddie Cibrian.
But talking to People magazine, she said the 'hoopla about my body' has been deeply upsetting.
'For someone like me who is healthy, who works hard for my body, it's very frustrating,' she said.
'I work out and take care of myself, and not in an over-obsessive way.
'People are calling me bulimic or anorexic, and these are real issues and diseases – that I don't have.'
Her trainer, Michael Jackson at Equinox in Woodland Hills, California, added, 'My main concern with her is that she's toned and healthy. And she is.'