It is from this video. It is at around 2 minute and 25 second. Here is the context:
Another group of researchers took a look at the evidence out there in 2013, and concluded that habitually eating breakfast did help children to stay on task in school.
Does this mean it helps them to stay concentrated on their task, or it helps them to do it? If I am right, then why was an article omitted before the word task?