To start losing weight effectively, begin slowly and strategically by addressing your worst eating habit. This focused approach allows you to make manageable changes without feeling overwhelmed. Identify the eating behavior that most significantly impacts your weight—be it snacking late at night, consuming too many sugary drinks, or overeating during meals. Once identified, develop a plan to gradually replace this habit with a healthier alternative. Implementing these small, strategic changes can lead to significant, sustainable weight loss over time.