The Paleo diet (Paleolithic diet) is based on foods presumed to be eaten by early humans — before agriculture and food processing.

What the Paleo diet includes:

• Meat, fish, seafood, eggs
• Vegetables, fruits, nuts, seeds
• Some roots and tubers

What it excludes:

• Grains, legumes, dairy
• Refined sugar, processed oils, salt
• All processed foods

Evidence:

• Short-term studies show improvements in blood sugar, lipids, blood pressure
• High in protein and fiber — satiating
• Eliminates most ultra-processed food by default
• Long-term outcomes poorly studied

Criticisms:

• Eliminates legumes and whole grains — both strongly associated with longevity
• "Paleo humans" ate widely varied diets depending on geography
• Expensive and difficult to sustain

Reference:

Wikipedia: Paleolithic diet

https://en.wikipedia.org/wiki/Paleolithic_diet