How to convince my parents that I'm not dieting but eating healthy ?

Hi,I used to be overweight (weighed about 160 lbs) when I was 14 my height is 5,10. I started dieting when I was 14 and a half years old because everybody at school bullied me, called me names, and obviously wanted a girlfriend . Now after dieting and fortunately reaching my goal I weigh 140 lbs with the same height. I started taking care and maintainig my weight by not eating high calorie foods,bread and fast foods. Currently I eat a lot of vegetables and fruit but my parents still think I'm dieting and tell me to stop or theyll send me to the psychologist but I'm happy the way I eat. Also my both parents are overweight and I try telling them that what they eat is unhealthy but they ignore me and since I eat a lot of fruit they think I ONLY EAT THAT ! , but I always prepare myself healthy meals according to the specific portion size which include many lean cuts of protein and vegetables. But my parents think I should eat more because they think I'm eating like a girl!.Also I work out daily and keep myself active.I eat about 2000 calories a day. So please I need to know how to convince my parents I'm not dieting any more but eating healthy.