he should reduce intake of fat containing foods like oily foods, fried items, ghee.
he should take more of vegetables and fruits in the diet ( fibres) these contain more potassium and magnesium , these help in controlling blood pressure.
he should reduce salt intake lees than 2300,mg per day.
daily exercise like brisk walk helps in controlling blood pressure , deep breathing exercise will also help.
for detailed chart you consult a dietician they will calculate based on height and weight
if you follow above guidelines it will help.