Is there an app or service that would take these two data points: location (from Foursquare check-ins or Google Maps Timeline) and weight (from Apple Health, etc.), and record the weight gain against that check-in? So you weigh yourself in the morning, you check-in at McDonalds at lunchtime, then you weigh yourself again in the evening. Repeat the next day and every day and change McDonalds to some other venue. Then rank the venue check-ins by subtracting morning weight from evening weight.