I am a 6' Netherlander (among the shortest men in my family). I just traveled to Shanghai and met a lot of very short Chinese people - but I was surprised to see that there seemed to be a small population of some young men who were as tall or taller than me.
When I asked about these tall Chinese of a native, she explained that they were from northern China, and that they have a harsher climate and eat more fish and protein than locals. Many of the locals grew up subsistence farming under Mao, mostly eating rice, and she explained that the weak nutrition of the resulting diet resulted in less growth.
This is, of course, anecdotal. But in comparison to Dutch height gain, I haven't heard of a similar change in Dutch nutrition or health, at least not relative to peer countries.