We don't recommend using ANY product as your only source of nutrition, especially long term.
Recently, we've seen some "food replacement" companies promote the idea that you should only consume their product. However, everyone else in the nutrition community would agree that you should get your nutrients from a wide variety of sources.
Although Ka'Chava helps control hunger, it only has 240 calories, and most people need 2,000-2,500 calories a day to maintain their current weight.
Ka'Chava is designed as a once-per-day meal, maybe twice if you're trying to lose weight or making smoothies with other ingredients for added calories and a variety of nutrient sources.
Check out The Ka'Chava Kitchen for some delicious recipe ideas.