Four decades of fad diets arranged in concentric rings from center to edge

2x2 grid, do this for 4 fad diets of different decades:   A top-down concentric arrangement where [THEME] objects radiate outward in rings from a single core, the origin/oldest at the dead center and the newest/outermost at the edge, the full radial growth forming the silhouette of [SHAPE] ::5  Ring Logic: AI_INFER 30–40 themed objects ordered from source to latest, laid into concentric rings like tree-growth bands — each ring one stage outward, the progression reading clearly from center to rim ::5 Composition: Concentric radial rings, even ring spacing, clean silhouette edge, generous margin ::3 Material Physics: Real themed objects, era-accurate materials and wear per ring, consistent matte finish, soft shadows ::2 Illumination: Flat overhead softbox, no glare ::2 Typography: Tiny ring labels along one radius ::2 Render Stack: Concentric-ring flat-lay, tree-ring timeline, radial-growth collection, 8k ::1 Negative: [scrambled rings, broken center, broken silhouette, overlap, tilt, 3d perspective, hands] ::-1