A healthy identity supports good habits, while all-or-nothing food rules work against them

Key takeaways

• A 2010 research review, as later researchers summarize it, found that how you see yourself helps predict what you plan to do, even after counting your attitudes, others’ expectations and your sense of control¹.
• A review of programs built to strengthen people’s identity as active people found that identity shifted only slightly, and the authors concluded it may change less than behavior does³.
• In a survey of 241 adults, thinking of food as all good or all bad helped explain why strict eaters tended to regain weight⁶.
• Orthorexia, an unhealthy fixation on eating “pure” food, is not an official diagnosis, but 47 experts from 14 countries agreed on proposed criteria in 2022¹⁰.
• If food rules start running your days, the National Alliance for Eating Disorders helpline, staffed by licensed therapists, is 1-866-662-1235¹¹¹².

Picture someone three months into a new way of living. (She’s a made-up example, but a familiar one.) She cooks from scratch, walks every morning and reads every label. She feels better than she has in years.

She also has a shelf of supplements she isn’t sure about and a phone full of wellness videos. Her list of foods she won’t touch seems to grow every week. Last weekend, she skipped a friend’s birthday dinner because she didn’t trust the menu.

Psychologists who study identity would see two things happening at once. The first is good news: people who see healthy living as part of who they are tend to plan for it and do more of it¹³.

The second is a warning. The same identity, held too tightly, can harden into all-or-nothing rules. Research links that kind of black-and-white thinking about food to weight regain⁶. At the far end, it can become an unhealthy fixation on eating “pure” food¹⁰.

This guide covers what research says about becoming a natural-health person, what tends to go wrong in the eager early months, and a month-by-month plan for a first year that lasts.

Who you think you are helps predict what you do

A leading theory in health psychology predicts behavior mainly from three things. It looks at your attitude toward an action, what people around you expect, and how much control you feel you have. This set of ideas is called the theory of planned behavior¹.

Then a fourth factor kept showing up. Self-identity, meaning whether you see a behavior as part of who you are, helps predict what people intend to do even after those three are counted. A 2010 meta-analysis by Rise, Sheeran and Hukkelberg in the Journal of Applied Social Psychology is the paper later researchers cite for this point¹. (A meta-analysis pools the results of many earlier studies.)

Critics, including the researchers Fishbein and Ajzen in 2010, argued that “identity” was just another way of saying a behavior feels important¹. A 2018 study in the European Journal of Social Psychology tested that idea with 113 people and a habit many natural-health readers care about: recycling food waste. Identity and importance turned out to be different things, and identity still added predictive power¹.

Identity also matters more for some people than for others. In a 2006 study, 241 people answered questions about 30 different behaviors. The researchers found one group whose plans were driven mainly by self-identity, while another group leaned more on the standard factors².

Act first. Don’t wait to feel like a new person

Exercise research adds a useful twist. A team led by Ryan Rhodes at the University of Victoria in Canada pooled 40 results, covering 4,939 people, from programs that tried to build a “physical activity identity”³.

The programs did nudge identity upward, but only a little. In the 30 studies that also measured physical activity, the effect on activity was larger, and the authors concluded that identity may change less than behavior does³. The researchers also flagged possible publication bias, meaning studies with good results may be more likely to get published, so treat the exact sizes with care³.

Our reading of this is freeing, though the review didn’t test which comes first. You don’t need to feel like a “natural-health person” before you start. Your actions can change faster than your self-image, so begin with the actions.

How you phrase the identity may matter too. This next point is practical advice, not a research finding. “I’m someone who cooks most of my meals” leaves room for real life. “I never eat processed food” sets a test you will eventually fail.

The famous stages of change are useful words, not a proven map

If you’ve worked with a health coach, you may have heard of the stages of change. The model, formally called the transtheoretical model, describes five stages: precontemplation, contemplation, preparation, action and maintenance⁵. In plain words: not thinking about it, thinking about it, getting ready, doing it, and keeping it going.

The model is everywhere in health promotion. Nik Tuah of Imperial College London, who led a 2011 Cochrane review of it, pointed to how widely it is used and called for more high-quality trials⁵. Cochrane is an independent network known for careful reviews of medical evidence.

The evidence for the model’s main promise is thin. A Cochrane review of 41 trials with more than 33,000 smokers found that self-help materials and counseling beat usual care. But in the four trials that offered the same help with and without matching it to a smoker’s stage, the matched version worked no better and no worse⁴.

A 2011 Cochrane review of weight loss found five trials. Stage-based programs led to 2 kilograms (about 4.4 pounds) or less of weight loss, with no convincing evidence that it lasted⁵.

The fair reading: the stages give you handy words for readiness, and “thinking about it” is a real step. Use them to describe where you are today. Don’t expect a program built around your “stage” to work better because of it.

The convert phase: when enthusiasm turns into all-or-nothing rules

Call the early months of a new lifestyle the convert phase. It isn’t a medical term. It’s a name for a familiar pattern: a burst of energy, a fast-growing list of rules, and a new sense that some foods, products and people are “good” or “bad.”

The energy is useful. The black-and-white part is where research raises a flag.

Katerina Palascha and colleagues at Wageningen University in the Netherlands surveyed 241 adults about how they think about food and how their weight had changed over five years⁶⁷. People who restricted their eating more tended to regain more weight. Black-and-white thinking about food helped explain that link⁶.

Palascha described the pattern to the university’s news magazine. An all-or-nothing eater who slips decides the whole plan has failed, gives up and overeats. A flexible eater can overdo it one night and simply return to normal the next day⁷. One survey can’t prove cause and effect, but the pattern fits older work on rigid versus flexible dieting⁸.

Strictness may not buy you extra results, either. In a small randomized trial published in 2021, where people were assigned by chance to one approach, adults who lifted weights followed either a flexible or a rigid diet for 10 weeks. Among the 23 who finished, both groups lost similar amounts of weight and body fat, with no meaningful difference between them⁸. About 40% dropped out, so the trial is a small hint, not a final answer⁸.

The convert phase can also strain relationships. In the excitement, it’s easy to start correcting what others eat or to treat a family dinner as a test.

If that’s happening, a simple line helps: “I’m eating this way because I feel better. I’m not asking anyone else to.” Our guide “What helps in a family health argument, since facts alone rarely win” covers the harder conversations.

When eating well becomes a fixation

In 1997, Steven Bratman coined a word for healthy eating that turns harmful: orthorexia⁹. It is still not an official diagnosis. It isn’t listed in the DSM-5, the main U.S. manual of mental disorders, or in the World Health Organization’s ICD-11⁹.

Nobody knows how common it is. A 2021 review found that studies using a questionnaire called the ORTO-15 put it anywhere from about 7% to 75% in general-population samples, and even higher in some student groups. Other tools gave different answers again⁹.

The ORTO-15 performed poorly. In one validation study, only about 18% of people it flagged at a standard cutoff turned out to have the problem, so the review’s authors said it should not be used to judge orthorexia⁹.

In 2022, 47 experts from 14 countries tried to bring order to the field. Using a structured voting process, they agreed on 27 of 67 proposed statements¹⁰. Their draft criteria describe:

• Rigid, self-imposed food rules and a strong preoccupation with eating “healthy” or “pure” food¹⁰.
• Anxiety or guilt when a rule is broken, and self-worth that rises and falls with following the rules¹⁰.
• So much time spent planning, buying and preparing food that work, school or social life suffers¹⁰.
• Physical harm, such as nutrient shortfalls from cutting out too many foods¹⁰.
• Symptoms lasting at least six months, or three months if health is badly affected¹⁰.

The panel was careful about values. Food limits that come from personal values, religion, culture, money or a doctor’s prescribed diet don’t count. The experts also said vegetarian and vegan diets should not be confused with orthorexia¹⁰.

The panel did list several things linked to orthorexia, though evidence was mixed: perfectionism, a strong need for control, heavy influence from social media, competitive sports, nutrition training and plant-based eating¹⁰. These are criteria proposed by experts, not yet tested in large studies¹⁰.

The money and the information flood

Spending can climb fast. The latest national estimate on the National Center for Complementary and Integrative Health (NCCIH) website comes from 2012. That year, Americans paid $30.2 billion of their own money for complementary health approaches¹³. That was 9.2% of everything they paid out of pocket for health care¹³.

Natural product supplements took $12.8 billion of it. That’s about a quarter of what Americans paid out of pocket for prescription drugs¹³. Visits to complementary practitioners took $14.7 billion¹³.

The information comes even faster. In a July 2025 KFF poll, 55% of U.S. adults said they used social media for health advice at least now and then. And 72% of all adults had seen content about weight loss, diet or nutrition in the past month¹⁴.

Few people trust what they see. On every platform, fewer than 10% of users said most of the health information there was trustworthy¹⁴. Among people who regularly follow health influencers, 61% said those influencers are mainly motivated by money¹⁴.

That mix of high spending and low trust is exactly where the convert phase does damage. Three habits help:

• Wait before you buy. Give any new product a 30-day waiting period. If you still want it, check its evidence first. Our guide “Six questions to ask before you buy anything for your health” walks through how.
• Set a monthly wellness budget. Write it down, and swap one product out before adding another.
• Pick a few steady sources. Choose two or three you trust, such as NCCIH and your own clinician, and give feeds a time limit.

A first-year roadmap

This plan is built from the research above. For how long new habits take to feel automatic, see “Behavior science tested its own tricks at scale, and rewards and repetition held up”.

Months	Main focus	Try this	Watch for
1–3	Start small	Pick two or three changes tied to your values, such as cooking dinner four nights a week or a daily walk. Keep a short log of how you feel.	Replacing your whole pantry at once, big purchases and hours of daily scrolling
4–6	Make it routine	Review your log. Keep what helps. Rate one product or claim using the four-level evidence scale. Set a monthly budget.	Rules that keep multiplying, tension at shared meals and spending creep
7–12	Make it yours	Tell your clinician everything you take. Plan for meals you don’t control, like holidays and travel. Drop what isn’t working.	Food anxiety, skipping social events and self-worth tied to perfect eating

Two moves help in every phase. First, describe your identity in flexible terms (“I mostly eat whole foods”). Second, keep one relationship where food isn’t the topic.

At the one-year mark, ask yourself three questions. Do I feel better? Is my life bigger or smaller than a year ago? Would I recommend this exact routine to someone I love?

Natural health at its best has room for birthday cake

Many people come to natural health for things that make life fuller: energy, time outdoors, cooking for people they love, and feeling at home in their own bodies.

Rigid rules can work against those goals. A list of forbidden foods can keep you from the table where community happens. A habit of judging food as pure or impure can spill over into judging people.

Flexibility isn’t a betrayal of natural-health values. It’s how you keep them for decades instead of months. Eating a slice of cake at your niece’s birthday doesn’t undo a year of good meals. Skipping the party might cost you more.

What the evidence says

Claim	What research shows	Evidence level
Seeing yourself as a healthy person supports healthy behavior	Self-identity predicts intentions beyond attitudes and norms12; programs raise activity identity a little3	Promising but early for building identity on purpose; consistent links in surveys
Matching help to your stage of change works better	Staged help did no better than the same help unstaged in four smoking trials4; small weight loss with no clear sign it lasted5	Not enough evidence that stage matching adds benefit
All-or-nothing food rules backfire	Black-and-white food thinking helped explain weight regain in one survey6; flexible and rigid diets did equally well in a small trial8	Promising but early
Orthorexia is a defined, measurable condition	No official diagnosis; estimates from one quiz range from about 7% to 75%9; expert criteria proposed in 202210	Not enough evidence for reliable numbers; criteria still being tested
Most health content on social media is trustworthy	Fewer than 10% of users on any platform say so14	Not a health claim; a measure of public trust

Questions readers ask

The bottom line

Seeing natural health as part of who you are tends to go hand in hand with following through. Start with actions rather than waiting to feel like a new person.

Watch the convert phase. All-or-nothing rules, shrinking food lists, rising spending and strained meals with loved ones are signs to loosen your grip. The goal of a natural-health life is a bigger life, and a good first year leaves room for real meals with real people.

Related reading

• Most people turn to natural health because it fits their values
• Behavior science tested its own tricks at scale, and rewards and repetition held up
• What helps in a family health argument, since facts alone rarely win
• Six questions to ask before you buy anything for your health
• Pressure makes loved ones hide their habits, and other kinds of help work better

Sources

1. Reid M, Sparks P, Jessop DC. “The effect of self-identity alongside perceived importance within the theory of planned behaviour.” European Journal of Social Psychology, 2018 (abstract, citing Rise J, Sheeran P, Hukkelberg S, “The role of self-identity in the theory of planned behavior: A meta-analysis,” Journal of Applied Social Psychology, 2010). doi.org
2. Hagger MS, Chatzisarantis NLD. “Self-identity and the theory of planned behaviour: Between- and within-participants analyses.” British Journal of Social Psychology, 2006. pubmed.ncbi.nlm.nih.gov
3. Rhodes RE, Wierts CM, Kullman S, Magel E, Strachan S. “Intervention effects on physical activity identity: a systematic review and meta-analysis.” Health Psychology Review, 2024 (summary posted by the University of Victoria, 2025). onlineacademiccommunity.uvic.ca
4. Cahill K, Lancaster T, Green N. “Stage-based interventions for smoking cessation.” Cochrane plain-language summary. cochrane.org
5. ScienceDaily, from Wiley-Blackwell materials. “Frequently used weight-loss method is light on evidence.” October 4, 2011 (on the Cochrane review led by Nik Tuah, Imperial College London). sciencedaily.com
6. Palascha A, van Kleef E, van Trijp JCM. “How does thinking in Black and White terms relate to eating behavior and weight regain?” Journal of Health Psychology, 2015. research.wur.nl
7. Resource (Wageningen University & Research). “Dichotomous thinking leads to difficulties in losing weight.” July 1, 2015. resource-online.nl
8. Conlin LA, Aguilar DT, Rogers GE, et al. “Flexible vs. rigid dieting in resistance-trained individuals seeking to optimize their physiques: A randomized controlled trial.” Journal of the International Society of Sports Nutrition, 2021. link.springer.com
9. Niedzielski A, Kaźmierczak-Wojtaś N. “Prevalence of Orthorexia Nervosa and Its Diagnostic Tools: A Literature Review.” International Journal of Environmental Research and Public Health, 2021. pubmed.ncbi.nlm.nih.gov
10. Donini LM, Barrada JR, Barthels F, Dunn TM, et al. “A consensus document on definition and diagnostic criteria for orthorexia nervosa.” Eating and Weight Disorders, 2022. personal.unizar.es
11. National Alliance for Eating Disorders. “Eating Disorders” brochure, 2025. allianceforeatingdisorders.com
12. Find A Helpline (ThroughLine). “National Alliance for Eating Disorders” helpline listing. findahelpline.com
13. National Center for Complementary and Integrative Health. “Americans Spent $30.2 Billion Out-Of-Pocket On Complementary Health Approaches.” NIH press release, June 22, 2016. nccih.nih.gov
14. KFF. “KFF Health Information and Trust Tracking Poll: Health Information and Advice on Social Media.” KFF, August 2025. kff.org