Subject verb for causes/cause
Solution 1:
Correct: 'A diet high in oil causes more obesity than diet high in sugar.' because the subject is, 'a high diet', so you would conjugate the verb, 'to cause', as you would for he, she, or it.
Correct: 'A diet high in oil causes more obesity than diet high in sugar.' because the subject is, 'a high diet', so you would conjugate the verb, 'to cause', as you would for he, she, or it.