Brief Answer:
different functions

Detailed Answer:
HI, thanks for using healthcare magic

Nutritionist would: (1) gather information on diet history including main meals/snacks/drinks,

(2)estimate the amount of protein, fat and carbohydrates used and the types (eg simple or complex carbs)

(3) estimate of calorie intake

(4)assess likes and dislikes, allergies or conditions to develop a program/diet plan that may work best for particular person

(5)check for the presence of any illnesses/diseases particularly chronic conditions such as diabetes, high blood pressure, high cholesterol

(6)assess weight and height (to calculate BMI), waist circumference (in some cases), skin fold thickness (in some cases)

(7)some nutritionist do a few tests as well but an in depth blood assessment is not usually done unless the nutritionist is working with a physician

I hope this helps, feel free to ask any other questions

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Brief Answer:
online assessment, doctor or local hospital

Detailed Answer:
HI

In some countries there are online sites that allow you to find a nutritionist in your area and also get an idea of their rating

If this is not an option then your family doctor should be familiar with nutritionist who has been successful in the past and who may be helpful. Most would be familiar with different nutritionist and should be able to guide you to a good one.

Alternatively, your local hospital may have a nutritionist on staff.

Losing weight can sometimes be difficult but helps in many areas of life.

Diet changes and exercise are helpful but diet helps more.

There are different diet plans, you would need to find the one that works best for you , that you are more likely to stick to.
The main ones are low carb and low calorie/fat.

The faster initial weight loss is with low carb.

In both would need to cut out any sodas or fruit juices or syrups since they are full of sugar (unless using diet soda with no carbs or calories).
Water should be used instead.

In low carb, can try making 2 main meals -NO carb and the low carb (use a small amount). CARBS - flour products (bread, pastry, biscuits, cakes, etc), rice, pasta, potatoes etc
So breakfast would be a form of protein (animal or plant) along with fruit (can use fruit carbs) or salad or vegetable.
Same for another meal.
The other main meal can have a small amount
Need to use a lot of water because will feel thirsty. Cucumber helpful because very few calories and carbs and will fill you.
Nuts can be used as snacks.

If diabetic, medication needs to be adjusted

For low fat/low calorie- again no sodas/fruit juices. Need to count the calories of each meal. Try to reduce the amount of calories that you use daily by 500 to 1000, this causes weight loss.
It would involve reducing portion sizes and using more fruits, vegetables, salads. Half the plate would be fruit/veg/salad. A small portion of carb (rice/potato/pasta) along with a small portion of protein
Cucumber is also helpful here

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