I have used the Cambridge diet in England (Dr. Howard's Success Diet Plan in the US) as a low calorie complete meal substitute. Lyfe Fuel is less expensive, has more protein, and has more than 1/3 of the minimum daily requirements of many nutrients. On the packaging, it says it is the most nutritionally complete meal on the planet. However, it is low in calcium, has no iron, is low in phosphorous and potassium. (Cambridge is higher in all of these.) Because I live on the supplement for a month at a time, periodically -- I am having to supplement Lyfe Fuel -- probably with 100 calories of spinach per day. Taste is good. Price is good. Looking forward to results.