Firstly, I think you should psyche yourself up and tell those girls to grow up. Even better if you can find some data about obesity and people who avoid going to the doctor because they are afraid of being judged, and do a presentation on it to the class. It's ridiculous that anyone going into nursing feels it's ok to judge people on their size.
As for the binging, I think you have to find what works for you. I truly believe that weightloss is mostly about psychology. I mean, everyone who's overweight knows that their eating habits are causing their weight gain, but few are able to make any significant long term change to their behaviour. You've got to hack your own brain.
For example, I can't do cfmama's "just say no". Food for me is a way to rebel, and if I start to feel deprived, I get peeved and it generally results in a binge. What's worked over the last six months is to say yes to a lot of non food things, so as to avoid the feeling of deprivation. I say yes to paying someone else to clean my car and wax my eyebrows, I eat (healthy) takeaway when I can be bothered to cook, I buy expensive fitness tools and new clothes when my old ones are too big. I also go out to dinner with friends, (though I choose nutritionally valuable food, and I generally won't finish it) and I eat birthday cake (but within my calorie allowance).
Try to understand why you binge: where the "high" is from the binge, what your trigger foods or emotions are, how you manage to ignore the voice telling you to stop, and when and how during a binge do you regain control. Then start experimenting with strategies to avoid or limit the damage. I can now recognise when I feel the need to binge, and why, and I therefore generally avoid it. For example, after a horror of a day at work on Wednesday, all I wanted to do was go home and eat myself into a stupor. But instead, I went and bought a present for a friend, which often gives me a similar high to eating, and some hard mints to satisfy the desire to crunch something, and when I got home, I call my mum and ranted to her. Total damage of what would have been in the past KFC + chocolate + chips: 6 mints, or about 20 calories. Oh, and don't be afraid to waste food. I would force myself to finish everything I had bought so as to restart my diet the next day without any junk in the house. Now I throw it away, or put it away, or give it to someone else. I had chocolate in my fridge for three months, because I stopped when I didn't want any more.
Good luck
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