Table 3. Obesity-related themes from the LDA model.

Topic	Most Likely Topic Components (bi-grams)	Theme	Percentage Tweets
2, 20	Childhood obesity, school lunches, pizza vegetable, pizza tomato, diet soda, vending machine, parent education, tomato paste, obese kid, fight childhood, help childhood, physical activity	Childhood obesity and schools	4.79
7, 13, 17	Calorie diet, calorie burn, obesity program, eating habit, eat rule, obesity awareness, weight loss, body mass, program prevent, eat salad, food stamp, achieve healthy, fight obesity, health news, avoid holiday, burn calorie, curb weight, food industry, avoid weight, food desert, health center	Obesity prevention	6.96
16, 21, 25, 29	Corn syrup, fructose corn, corn sugar, coca cola, food addict, get fat, lay bed, thanksgiving dinner, video game, holiday weight, McDonald, fries, junk food, ice cream, fat junk, food effect, eat chocolate, food epidemic, soft drink, grocery store, food night, super bowl, eat candy, Chinese food	Obesity and food habits	9.68

Notes: Column 1 shows the topic numbers, column 2 shows the most likely topic components or bi-gram terms from each topic, column 3 describes the topic themes, and the last column is the percent of tweets that used any of the bi-gram words within each theme.