Nothing extreme, but two dress sizes later she's happy. This year she's going to two five pound bags of sugar for her five minute exercise routine - and switching to low fat donuts. No big deal, but that's exactly why she succeeds. Then they started again. We tend to think that if we don't keep our resolutions they're trashed until next year.
Successful change means accepting our fallibility.
One friend put it in simple terms. No, you get back to your normal schedule as soon as possible. There were morning when she just couldn't get up the energy to take a walk. If she felt better later in the day, she'd go walking then, if not she made sure to get back on track the next day. She never gave up entirely.