Long-term use of birth control pills can be fattening because one of the most obvious clinical side effects of birth control pills is that they can cause weight gain. Oral contraceptives can cause changes in hormone levels, causing water and sodium retention in the body, which can lead to weight gain. Therefore, oral contraceptive pills are not recommended for contraception as a last resort. Clinically, if you take oral contraceptives, it is best to take vitamin B1, vitamin C, and vitamin E. Because the pill not only increases weight, but also causes discoloration on the face, so vitamin C, vitamin B1, and vitamin E can restore the elasticity of the skin and reduce discoloration. There is another side effect of oral contraceptive pill, which is that it can make menstrual disorders. So it is recommended that in daily life, it is best to use condoms for contraception to avoid side effects caused by oral contraceptives.