The image promises a secret. The evidence points toward something less sensational but more useful: a combination of varied nutrition, physical activity, preventive care, avoiding known risks where possible, and seeking medical attention when needed.
So enjoy celery if you like it. Drink lemon water if it suits you. Include a wide range of nutritious foods and build routines that you can maintain. But do not rely on one vegetable or drink to prevent or treat cancer.
The most valuable health lesson is not that one food can guarantee a long life. It is that informed choices, supported by reliable medical care, can help us look after our health throughout the years.