Weight Loss and Metabolic Health: AI Visibility Market Discovery Index

Benchmark Summary

WeightWatchers is the current coverage leader in October 2026, with valid recommendation coverage of 54.1%, ahead of the next-ranked brand by 4.7 percentage points. Valid recommendation coverage is the share of qualified observations in which a brand appears in a valid recommendation shortlist.

The month's largest coverage increase belongs to Ro, which moved to 49.4% in October 2026 from 0.0% in July 2026, a rise the benchmark classifies as significant. The largest coverage decline belongs to Ro (Roman), which moved to 0.0% in October 2026 from 17.6% in July 2026, a drop the benchmark classifies as significant.

The benchmark produced 255 qualified observations in October 2026 from 800 source prompt-surface observations.

Current Benchmark at a Glance

Qualified surface breadth is the number of canonical AI/search surface families with at least one qualified observation, out of six families: ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode. Qualified observations reached 286 in September 2026, the intermediate month.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Weight Loss and Metabolic Health

Research Scope and Qualification

Questions This Section Answers

• How many of the 800 prompt-surface observations qualified for the Weight Loss and Metabolic Health benchmark in October 2026?
• Why is the public benchmark narrower than the raw brand and competitor mention collection?

The public benchmark is narrower than the raw collection universe by design.

Brand-level percentages use the qualified observations as the public denominator, not the raw collection. Per the AI Visibility Market Discovery Methodology, the funnel is intentionally conservative, and the public index reflects only the qualified subset.

Current Brand Standings

Questions This Section Answers

• Which weight loss and metabolic health brands lead on valid recommendation coverage in October 2026?
• How do presence rate and valid recommendation coverage differ across the tracked brands?

How to Read the Standings

• Presence rate: The share of qualified observations in which the brand is mentioned at all.
• Valid recommendation coverage: The share of qualified observations in which the brand appears in a valid recommendation shortlist.
• Top-three rate: The share of qualified observations in which the brand appears in the first three recommendation positions.
• Rank-one rate: The share of qualified observations in which the brand is the first recommendation.
• Net sentiment: The balance of positive over negative mentions, from -1 (all negative) to +1 (all positive). Net sentiment describes benchmark framing, not customer sentiment.

For formulas and denominator rules, see AI Visibility Market Discovery Metric Definitions.

Recommendation Coverage Movement

Questions This Section Answers

• Which weight loss brand posted the largest coverage increase since the July 2026 baseline?
• Which brand recorded the largest significant coverage decline, and how long has that decline persisted?

Largest Increase: Ro

Ro posted the month's largest significant increase, with valid recommendation coverage rising to 49.4% in October 2026 from 0.0% in July 2026, a rise of 49.4 percentage points. Coverage also rose versus the immediate prior month, moving to 49.4% in October 2026 from 32.9% in September 2026, extending a two-month streak of month-over-month increases. Ro registered 126 valid recommendation observations in October 2026.

Largest Decline: Ro (Roman)

Ro (Roman) declined to 0.0% in October 2026 from 17.6% in July 2026, a drop of 17.6 percentage points the benchmark classifies as significant. The brand has recorded no valid recommendation coverage in each of the two months since September 2026.

Category Leader: WeightWatchers

WeightWatchers remains the category leader at 54.1% valid recommendation coverage in October 2026 versus 41.2% in July 2026, a rise the benchmark classifies as significant. The brand's rank-one rate rose to 19.2% in October 2026 from 10.6% in July 2026. Presence rate rose to 68.6% in October 2026 from 61.2% in July 2026, within normal month-to-month variation.

Other Notable Movement

Found rose to 38.0% in October 2026 from 22.9% in July 2026, a significant increase of 15.1 points, and also rose versus the immediate prior month, to 38.0% in October 2026 from 24.5% in September 2026. Hims rose to 21.2% in October 2026 from 13.5% in July 2026, a significant increase of 7.7 points, extending a two-month streak of month-over-month increases. LifeMD rose to 4.7% in October 2026 from 1.2% in July 2026, a significant increase of 3.5 points, and also rose versus the immediate prior month.

Noom's valid recommendation coverage rose to 49.4% in October 2026 from 41.8% in July 2026, a cumulative change the benchmark classifies as stable within normal baseline variation. Coverage did rise significantly versus the immediate prior month, however, moving to 49.4% in October 2026 from 38.1% in September 2026. GNC, Herbalife, and Vitamin Shoppe also moved within normal month-to-month variation.

Recommendation Placement Snapshot

Questions This Section Answers

• How do WeightWatchers, Noom, and Ro differ in top-three and rank-one recommendation rates?
• Why can similar recommendation coverage still hide different first-position rates?

Coverage alone does not show how prominently a brand is recommended. Among the leading brands, placement patterns differ notably.

Noom holds a lower first-position rate than WeightWatchers despite similar overall coverage, while Ro's rank-one rate of 16.1% in October 2026 trails WeightWatchers' 19.2%. Close coverage can still hide different first-position rates.

Buyer-Intent Distribution

Questions This Section Answers

• Which buyer-intent classes produced qualified Weight Loss and Metabolic Health observations in October 2026?
• What buyer-intent classes does the public series not yet measure?

All 255 qualified observations in October 2026 fell into the Brand Recommendation class, as did all 170 in July 2026.

The current public series measures the Brand Recommendation class of discovery and does not yet contain qualified observations in the Pricing & Value or Multi-Brand Comparison classes.

Historical Measurement Record

Questions This Section Answers

• Which brand has led the Weight Loss and Metabolic Health benchmark in each measured month?
• How have qualified observations and leader coverage changed from July to October 2026?

Evidence and Source Layer

Questions This Section Answers

• What fields and evidence are retained in each prompt-level observation?
• Does a cited or present source prove that it caused an AI brand recommendation?

This benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure market share, attributable sales, every possible AI response, organic-search ranking, social mention volume, private and sponsored channels, or causality from a metric movement alone.

Top 10 Cited Domains

Questions This Section Answers

• Which domains were cited most often across AI platform responses in this measurement period?
• How concentrated are citations among the top 10 domains compared to the wider domain layer?

Across all AI platform responses in this measurement period, the benchmark observed 6,891 citations drawn from 1,678 unique domains.

Citations are broadly distributed rather than concentrated: the top 10 domains account for a minority of all citations, and the remaining share is spread across more than 1,600 other domains. Two tracked brands' own domains appear in the top 10, with ro.co at rank 5 and hims.com at rank 8, alongside gnc.com at rank 10. The most frequently cited sources are a mix of official brand sites, health and medical reference publishers, and general platforms, with no single source type dominating the citation layer.

About This Benchmark

The LLM Authority Index AI Visibility Market Discovery Index is a neutral, repeatable monthly measurement of how AI search surfaces represent brands in response to real consumer-style queries. The benchmark tracks presence, recommendation coverage, placement, and sentiment across six canonical AI surface families.

• AI Visibility Market Discovery Methodology
• AI Visibility Market Discovery Metric Definitions
• AI Visibility Market Discovery Research Standards
• Modeled AI Visibility Authority Value

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