Also, what are your goals? Are you satisfied with your current weight and body composition? Do you have particular health problems that might be improved by a change in diet? Or are you just generally looking to eat healthier?
BMI is just a simple formula of weight / (height^2) with weight in kg and height in meters. 19 to 25 is considered the healthy weight range, but weight and BMI do not take into account varying proportions of muscle versus fat (muscular athletes can be "overweight", but healthy with low body fat percentage, while the academic literature notes that a large percentage of "healthy weight" people have high body fat percentage, an unhealthy situation sometimes called "normal weight obesity").
You may want to consider your waistline measured at navel level. More than half your height is likely too large for good health.
Dietitians are trained to do what? I suppose it depends on what the client is trying to accomplish. Being overweight is probably a common complaint. You might ask if he/she thinks there is any such thing as "bad" food like candy, pastry, soda or potato chips. You might be surprised at the answer.