What do systematic reviews say?

Diluted (by at least 50%) vs undiluted lactose‐containing milk, milk products, or foodstuffs

Diluted (by at least 50%) may leads to lower treatment failure compared with undiluted lactose‐containing milk, milk products, or foodstuffs (low certainty).

• Lactose avoidance for young children with acute diarrhoea 2013 · Cochrane Headline outcomes only
  RR 0.65 [0.45, 0.94]
  9 studies · 687 participants
  Low