Feet contain about 250,000 sweat glands and are capable of producing 250 ml(one cup)of sweat a day.The smell came from bacteria on the skin that breakdown the sweat,excreting offensive swelling waste amount of persons feet sweat depends on their genetic make up and activity level.
But this problem can be solved to some extent because there are some home and over the counter treatment that can help to overcome this problem.
Home remedies

Perspiration and Body odour and Homeopathic Medicines:
Arsenic Album: Sweaty palms,worse in company.
- Calc Carb: Sweating,especially of the head,in infancy.
- China Offic.: Sweating and debility after illness.
- Flouric acid : The sweat has a sour smell.
- Merc Sol : When the sweat has an offensive odour.
- Phosphorus: Exhausting sweats,especially at night.
- Psorinum: Persistent sweating,especially menopausal.
- Silicea : Cold sweaty feet.
- Sulphur : Hot sweaty feet.