Issue with program not passing to other elif condition

[supuflounder]

if BMI<=18.4:
print('You are underweight')
elif BMI>=18.5 or BMI<=24.9:  # These should be 'and', not 'or'
print(' You have Normal weight')
elif BMI >=25 or BMI<=29.9: # And if I am 24.937?  No.  <= 18.4; >18.4 and < 25; >= 25 and < 30 
print('You are overweight')
elif BMI>=30 or BMI<=34.9:
print('You are moderately obese')
elif BMI >=35 or BMI<=39.9:
print('You are severely obese')
elif BMI>=40:
print('You are very severely obese')