Why does the system ban yogurt but allow cheddar, when both come from milk?
Yogurt vs cheddar
What the system says
The system distinguishes by how broken-down the casein structure is. Yogurt retains relatively intact milk proteins, while aged cheddar undergoes long enzymatic breakdown that — per the founder — makes the casein "easier to digest." Hence only hard, long-aged cheeses are permitted.
What science says
Scientifically: yogurt contains live bacteria that aid digestion and immunity, is rich in calcium and protein, and may ease lactose symptoms for some. Cheddar is also nutritious — but banning yogurt removes documented probiotic benefits. There's no evidence aging makes protein "safer" or yogurt "dangerous."
If you follow the system, calcium alternatives come from aged cheese (cheddar, rumi, parmesan), dates, tahini, and small fish like sardines. If you don't have a specific dairy issue, there's no medical reason to avoid yogurt.