Please don't eat between meals.

在两顿饭之间请不要进食。

youdao

You shouldn't snack between meals.

你不应该在两餐之间吃零食。

youdao

He supplements his regular meals by eating between meals.

他在两餐之间吃点东西来补充正餐。

《新英汉大辞典》

Researchers say American children now eat an average of three snacks a day between meals.

VOA: special.2010.03.17

They eat too many snacks between meals.

VOA: special.2010.06.07

Waiting too long between meals can turn normal hunger pangs into an out-of-control craving.

CNN: How to satisfy your cravings, healthily

Fasting insulin levels - recorded between meals - were significantly reduced in all the three diet groups.

BBC: NEWS | Health | Low-cal diet 'long-life benefits'

When it first came out in hardback, it was seen by the literary world as a snack between meals...

NPR: 'The Disappointment Artist' by Jonathan Lethem