Which lasted for four weeks? These smoothies are still at the Naturnica Keto counter, I have not used them; since then, I have renounced the Naturnica Keto liquid diet. What worked? To lose weight, my doctor said that the Naturnica Keto diet combined Naturnica Keto with exercise works. He gave me a diet to follow and I joined a gym. The Naturnica Keto diet includes cooking with fresh fruit and vegetables.