Actually i think physicians have little clue about nutrition and exercise and what works best but i seldom come across good trainers who know their stuff, which leaves a bad after taste in many people's mouth.
There will always be good and bad trainers like any profession, so relax sms
Anyway i've posted this somewhere in a female forum, so i'll post it here -
You should educate yourself on food choices and make a small tangible lifestyle change first.
Weight on the scale accounts for nothing, because the it can be water, glycogen, muscles, ligaments etc..
Tangible change would be your dress/pants size and waist line, the fact that matters - bodyfat and body composition.
It is a bad habit to starve yourself because you'd get a rebound which will affect you two times worst.
if you starved your body by cutting your calories drastically. You could just lose water and glycogen rapidly and lose your muscle mass then gain more fat - Your metabolism drops like a brick and your usual portions that you eat will be half utilized for energy and be stored as fats.
Of course a drastic 180 degree turn is not possible so here is some suggestions -
First of all cut out simple sugars, processed carbs - these are empty calories you need not have in your diet. They only serve to make you pre-diabetic, and cause your store a lot more fat than usual.
No white bread/noodles/pastry/sweeten drinks/white rice.
Replace all those with complex carbohydrate - best way to learn about it is via this site -
http://www.the-gi-diet.org/lowgifoods/ always strive to look for low GI food.
have more frequent meals, for starters reduce your portion size by half and spread it over 2 meals within the span of 3 hours.
e.g - breakfast at 7 am, snack at 10 am. Lunch at 12 pm, snack at 2pm, etc..
This will also serve to control your blood sugar spike and the fat storing hormone - insulin.
Remember the golden rule, if you have a high carb meal, then your fat intake within the same meal must be low - the opposite is true also, high fat low carb.
E.g of a high carb high fat meal - Charsiew/Roasted pork with white rice.
2nd incorporate resistance exercises to stimulate muscles to increase your metabolic demands. Muscles are your friend, they are expensive maintain in a good way because it demands energy for upkeep - the upkeep will come from food and your body.
For your case, the asthma is tricky but that doesn't mean you should be defeated by it and wait for things to get better, start slow and always have your inhaler with you at all times. Slow pace walks will be great to "test water", and slowly up the pace to brisk walking to see how you feel.
When you're ready with your physical capacity, then hit the gyms and start working out, still bear in mind - inhaler and start slow.
Remember its a lifestyle not a race, think tortoise and the hare.
Slow and steady will always win the race, just have to have patience and discipline.
Cover your big 3 and your set - Diet/Sleep/Exercise.
Don't give up, and always find ways to work around a problem rather than give in to it - theres a will theres a way.