Im breastfeedinh and started exercising can i drink slimmers shake wil it affect breastmilk?

Yes and No: When breastfeeding, only use meal replacements to provide a healthy option when you need a quick snack or an occasional quick meal (no more than once a day). Relying on liquid replacement meals more often than that won't provide the calories or nutrients you need for your own health or for nursing. That being said, it will not affect the composition of breast milk.