Most parents probably prioritise feeding their children above almost anything else. Then there are provisions like free school meals. So I wouldn't really expect the statistics to show many children not getting enough to eat.
You seem to be focussing on the correlation between poverty and obesity. That's well known, but there are a couple of key differences from the discussion at hand:
First, the poorest category is generally quite broad. I'm looking at one of your citations now, and it lumps all households below about $20k into the 'poor' bracket. The fact that obesity is more prevalent overall in that bracket doesn't mean that everyone in it gets enough to eat.
Secondly, getting the food you need isn't just about calorie intake. After all, a cup of vegetable oil has almost all the calories you need for a day. People need a balanced diet, including vitamins and protein and so on. So waistline measurements alone aren't enough to determine how many people aren't getting adequate food. News stories such as tinyurl.com/cqw7r43 suggest that poorer households are cutting back on fruit and veg as money gets tighter.
Finally, when people can't afford enough food, they are likely to turn to unconventional sources like foodbanks and dumpster diving. That people need to rely on charity and scavenging is a failure of society. We don't need to see people literally starving to death to accept that people have a problem getting enough food.