Our expert says:
If a woman goes on a sensible and balanced weight reduction diet this would NOT have any effect on falling pregnant. However, if the woman uses all kinds of diet pills and potions that cause diarrhoea, then the diarrhoea will prevent the contraceptive pills from being absorbed properly and expose the woman to the risk of falling pregnant. So if you are using a sensible diet and exercise to lose weight, there should not be a problem. If you are using diet pills and products, esp ones that cause diarrhoea, then you are at risk. However, you state that you are using the injection, which should not be affected by changes in bowel habits like diarrhoea.
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