Reference — Kindle Category Opportunity
Competition snapshot for the Health, Fitness & Dieting best-seller list, ease-of-entry score 37.5/100.
Category metrics
Score
37.5
Median reviews
467
Weak share (top 20)
15%
Median price
$9.99
Median star rating
4.6
Books scanned
50
Worth writing in?
Reference is between the extremes: 15% of the top 20 is under 100 reviews against a median of 467, so entry depends on the specific sub-genre and your launch strength. Read the breakout books below before judging. Ease-of-entry score 37.5/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on AmazonNo breakout books in this category.
High-frequency phrases in this category's titles
Mine all categoriesHigh-frequency phrases mined from the 50 best-seller titles on this category's list. The ease-of-entry score tells you how winnable the category is; these title phrases tell you which words readers search with — use the two layers together. Frequency is a title statistic, not a search-volume estimate.
| Phrase | Titles | Rank-weighted score |
|---|---|---|
| mayo clinic | 6 | 171 |
| complete guide | 5 | 78 |
| mayo clinic guide | 3 | 67 |
| diet 3rd | 2 | 66 |
| step by step guide | 2 | 63 |
| weight loss | 2 | 61 |
| comprehensive guide | 2 | 42 |
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More Health, Fitness & Dieting categories
Check the keywords before you write
Category scores show where entry is easiest; keyword lookups show whether readers actually reach for it. A free account includes keyword competition lookups plus unlimited category scans.
After you publish: why aren't readers buying?
Category research picks the direction; review diagnosis reads the readers. The same platform clusters a book's critical reviews into severity-ranked root causes, each anchored to verbatim quotes — see it applied to a full narrative-history title.
Keep researching with the free tools
Research snapshot scanned on Oct 19, 2026. Refreshed periodically — not live tracking.