A few years ago in early January, one of my relatives who was in her 60s told me that her New Year’s resolution was to lose thirty pounds. In February, I asked her how her diet was going, and she told me that she had quit the diet. When I asked why, she said, “The first week I lost three pounds. The second week I didn’t lose any weight. The third week I lost only a pound. The fourth week I didn’t lose anything. After that, I gave up.”