A social media post about healthy eating can look harmless enough: a carefully arranged meal, a list of foods to avoid or a creator explaining exactly what they eat to stay lean. But new research suggests some wellness content may blur the line between encouraging healthy habits and promoting rigid ideas about what healthy eating is supposed to look like.
Researchers analyzed 300 TikTok and Instagram videos tagged #healthylifestyle, #nutrition or #cleaneating. About two-thirds emphasized clean or healthy eating, nearly one-third included food rules or restrictions and about 1 in 5 used language that treated foods as “good” or “bad.” Many posts also linked eating choices with having a lean or muscular body.
The study, published in the Journal of Technology in Behavioral Science, was a content analysis. In other words, researchers looked at what appeared in the videos. They did not study viewers or test whether watching the posts changed anyone’s eating behavior, body image or risk of developing an eating disorder.
The researchers were especially interested in messages that resemble orthorexia nervosa, a term used to describe an unhealthy fixation on eating foods considered healthy or pure. It can involve strict food rules, cutting out entire food groups and distress when those rules are broken. Caring about nutrition or wanting to eat well is not the same thing.
To see how those themes appeared online, researchers collected the first 50 videos returned for each of the three hashtags on TikTok and Instagram. That gave them 150 videos from each platform. The study focused on content aimed at women and featuring female creators, so the findings do not represent all nutrition content on social media.
Across both platforms, 67.3% of videos emphasized clean or healthy eating. About 29% included food rules or restrictions, such as cutting out certain foods or presenting particular eating habits as requirements. Fear-based messages about food appeared in 16%, while 19.7% used moral language around food choices.
Appearance was also a major part of the content.
Body objectification appeared in 63% of the videos overall and was especially common on Instagram, where it appeared in 78% of posts compared with 48% on TikTok. Instagram creators were also more likely to feature lean or muscular bodies and to directly connect their appearance with specific food choices.
That creates an implied message: eat like me and you may look like me.
But food choices are only one factor that shapes appearance. Genetics, activity, health conditions and other individual differences matter too.
Supplements and so-called superfoods were also common, appearing in about three-quarters of the videos. More flexible messages were less common. About 15% of videos included balanced eating advice, while roughly 20% showed eating for pleasure or enjoyment.
Researchers also looked at who was giving the advice and how credible they considered it.
Seventy-eight percent of creators did not have a recognized health, nutrition or fitness qualification that researchers could identify through public information. Qualified professionals made up 22% of the sample.
The researchers classified 68% of the health information as misleading or deceptive and 5.7% as harmful. Qualified creators were much more likely to be rated as accurate: 45.5% of their posts were classified as credible, compared with 4.7% of posts from unqualified creators.
Those numbers need some context, because deciding whether social media content is “misleading” involves judgment.
For example, the researchers considered a “what I ate today to build muscle and stay lean” video misleading when it suggested that copying the creator’s meals could produce a similar body without acknowledging things like genetics or exercise. More extreme examples, such as very small meals paired with praise for food restriction, were classified as harmful.
To make those judgments more consistent, the team used a detailed coding system and had a second coder independently review 20% of the videos. Agreement between coders was high. Even so, the authors acknowledged that some categories, including whether information was credible, remained partly subjective.
The study also does not show that the creators themselves have orthorexia or that viewers will develop it after seeing this content.
What it does show is that rigid eating rules, food morality and appearance-focused ideas about health appeared often in this sample of popular nutrition and wellness videos.
That distinction matters because healthy eating does not have to mean perfect eating.
Interest in nutrition can be positive, and having food preferences or routines is not automatically a problem. Concern grows when eating becomes increasingly rigid, when whole categories of food are treated as inherently “bad,” or when someone feels they have failed if they do not follow food rules perfectly.
The study was limited to six hashtag searches across TikTok and Instagram, and social media feeds change constantly. It also focused on female-oriented content and did not examine how viewers interpreted or responded to the posts.
Still, the findings are a useful reminder that “healthy” and evidence-based are not always the same thing. Online nutrition advice can mix reasonable guidance with rigid rules, unrealistic body expectations and claims that make one person’s routine look like a formula everyone should follow.
The study reported no research funding.