All kids who reverse their b’s & d’s or their numbers have dyslexia or dyscalculia.
Failure to read or do maths is often more to do with the nature of teaching rather than the nature of the child. A child will not develop dyslexia or dyscalculia because he has trouble reading.
Multi-sensory exercises can help struggling students to strengthen their brain activity, but this will not cure their dyslexia or dyscalculia.
It is also not a dietary problem. No amount of healthy green juices, or other wholesome foods will reverse the conditions, but that does not mean you can eat unhealthily! In fact a healthy diet can improve your concentration and may help you control the conditions, so keep eating those greens, its and seeds!