How long can you stay on Optifast shakes for safe weight loss?
                                
                                
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                                    3 min read                                
                            
                                According to Optifast's own clinical guidance, the most intensive phase of their VLCD (Very Low Calorie Diet) program, which involves replacing all three meals with Optifast shakes, is recommended for up to 12 weeks. This initial period is designed for rapid weight loss and must be followed by a gradual reintroduction of food under medical supervision to ensure safety and long-term success.