Healthy morning ma’am,
Ayurveda, the strict avoidance of this combination is better explained, according to milk and fish are form of different styles, I. e. Fish being non- vegetarian food whereas milk, although an animal product, being a vegetarian food . Keeping the Ayurvedic philosophy in mind, this combination is incompatible because the different diet styles as well as because they completely opposite effects of our body. Since milk has cooling effects and fish has heating effects, their combination creates imbalance that can lead chemical changes in body.
Health Tips
This combination is bad for health, especially for people with weak immune system. Therefore, if you can, you should avoid it. As it’s better to be aware of its effects than blindly trusting a superstition or myth.