8cals per lb is ridiculously low. I would be looking at a variety of other things before going near that low.
For someone that weights 270lbs, what have you done so far to 'diet'. Honestly, at 270lbs (and im not saying thats all that big, i was 250lbs just a few weeks ago. ). Most people could just get by with not eating fast food, processed foods (chips, candy etc). The results for most, will come. If you got to 270lbs, im pretty sure you where not eating chicken breasts, seeds and salads.
Weight loss when you weight a little more is easier to start with, often 3+ lbs per week with just small changes. It is different for everyone though, I drop the burgers and pizza out and almost instantly im noticeably leaner.
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