Yesterday he said he wanted to turn around the health of children, as he accused the Government of going in "completely the wrong direction".
Sir Keir was willing to defy "nanny state" barbs after his party announced supervised teeth brushing at free breakfast clubs.
During a visit to Alder Hey Children's Hospital in Liverpool he also confirmed the party's ban on junk food adverts aimed at children.
Dr Senthil Seniappan told the Labour leader he was seeing children with "serious complications" due to being overweight or obese.
The children's doctor said: "In some boroughs 50% of young people are overweight or obese.
Shocked
"This is a huge problem for us now and for the future."
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