Hello,there is no need for concern abt mixing milk and banana or making smoothie out of it..
In fact both banana and milk are good for digestion..but I would recomend to add variety of fruits and vegetables in your diet so that you get all the benefit of nutrients from them
Next Steps
you work out daily that means your body needs appropriate nutrition for these activities so please follow balanced diet which is a must for you for a healthy body and lifestyle
Health Tips
for personalised diet plan or any therapeutic diet consult me further
regards,
Dr. amisha mirchandani