说明：  跟踪用户每日摄入的大量营养素（卡路里、蛋白质、脂肪、碳水化合物）。阅读提供饮食建议、健康或营养相关新闻的博客文章。搜索食谱，获取食物的营养信息。
(Keeps the track of the user s daily intake of macronutrients(calories, proteins, fats, carbohydrates).Read the blog posts providing information on dietary tips, health or nutrition related news. Search recipes and get nutritional facts about food.)