I know what it is like to be big and embarrassed about your size. You will see from my ticker that I had to tackle a similarly large weight loss project.
However - whatever size we are or were - we have a right to expect medical attention and to feel that we will be treated with respect.
Do yourself a favour and do two things.
Log the food that you are eating on fitday so that you see not just the calories but how many grams of protein, fibre, calcium, fats etc you are having each day and what the proportions of nutrients that you are getting are.
Print the reports out and ask your doctor to confirm that it is healthy for you to continue to follow it bearing in mind the heart health side of things. The fitday format should make it easy for him to assess and judge.
I would really hate for you to hit any problems. If there is heart disease in your family you could be extra vulnerable.
Be wary of dropping weight too quickly. You can feel like you want the project behind you and done - but it honestly is not the best way. For one thing you want to be losing fat. Quick weight loss often means that you are dropping water (mainly in the first couple of weeks) and / or muscle...
In addition you can be left with a major loose skin nightmare.
One percent of bodyweight per week is a safe level to be losing across the month. More than that tends to not be better than that...
At the end of the day - the decisions are yours...
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Margaret