https://phys.org/news/2018-07-google-reveal-cross-cultural-desire-food.html

The researchers report that while food searches were made consistently during most times of the day, two particular times stood out—7 p.m. and 2 a.m. During those two time periods, searches for delivery food places spiked. They report further that these two times were consistent across countries, and they stood out in both time periods tested. They suggest this pattern could be tied to our early ancestry—back when humans were still hunting or foraging for food, they tended to do so during particular times of the day. They further suggest that the trends they found on the internet could be a modern form of foraging. They note that such habits of old, when carried out in modern ways, could explain why humans tend to overeat, quite often to the point of obesity. They note that people of all cultures adhere to circadian rhythms and that foraging may be a part of that. They also note that the two different spikes might be attributable to two well-known chronotypes—morning people and night people.

                                                            
                                    
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Nicolas Scrutton Alvarado et al. Appetitive information seeking behaviour reveals robust daily rhythmicity for Internet-based food-related keyword searches, Royal Society Open Science (2018). DOI: 10.1098/rsos.172080