Oat milk sales have declined 18% year-over-year according to Nielsen data, as the plant-milk boom shows signs of plateauing with consumers citing taste fatigue and dairy's superior protein content as reasons for switching back.
Market Shift
The plant-based milk category peaked in 2024 at $2.9 billion in US sales and has since contracted to $2.4 billion.
- Oat milk: -18% YoY (Oatly stock down 70% from peak)
- Almond milk: -12% YoY
- Soy milk: +3% (experiencing a revival among protein-focused consumers)
- Traditional dairy milk: +5% YoY (first growth in 8 years)
- Ultra-filtered dairy (Fairlife): +28% — the real winner
What Changed
Consumer priorities shifted from sustainability signaling to protein optimization. A cup of oat milk contains 3g protein versus 8g in dairy and 13g in ultra-filtered dairy. Fairlife and similar high-protein dairy products captured consumers who wanted the nutrition of milk with the modern branding of plant alternatives.
