We all know that exercise works to tone your body and build muscle – but after countless crunches, sit-ups and planks, sometimes that firm, toned stomach can still elude us. Is your diet secretly sabotaging your best exercise efforts? The foods we eat have a huge effect on our appearance. Here’s the good news – eating certain foods can work to flatten your belly. Do you know what foods can turn your tummy from fat to flat? Test yourself now!