Dr. James DiNicolantonio on Animal Protein, Acidosis, and Bone Health

Animal Protein and Acid Load

• 🥩 Consuming a high amount of animal protein can lead to a significant acidosis in the body, primarily due to the oxidation of sulfur-containing amino acids like methionine and cysteine into sulfuric acid.
• 🧪 This process releases hydrogen ions, which are largely neutralized by the body's bicarbonate, causing an acute drop in bicarbonate levels and a temporary increase in acidity.
• 🦴 The resulting acidification of the interstitial fluid around bones can stimulate osteoclasts, leading to bone breakdown and calcium loss.

Kidney Function and Bicarbonate Production

• 💧 When the body neutralizes the acid load from animal protein, the kidneys work to reproduce the lost bicarbonate.
• ⚖️ In this process, the kidneys must also produce an equal amount of acid, which is then excreted in the urine, directly reflecting the initial acid load from protein consumption.
• 📉 While blood pH may remain within the normal range, a urinary pH of six or less indicates low-grade acidosis occurring for several hours after consuming animal protein.

The Role of Freshness and Buffering

• 🍖 Freshly consumed animal meat and fluids naturally contain bicarbonate, which helps to buffer the acid load.
• ⏳ However, this bicarbonate is depleted within about six hours post-mortem due to the buildup of lactic acid, making older meat more acidic.
• 🥄 Supplementing with sodium and potassium bicarbonate (baking soda) can effectively neutralize the acid load from animal protein consumption.

Long-Term Health Implications

• 📉 Studies, like the Belleview study on Arctic explorers, have shown significant calcium loss from bone over a year on a high animal protein diet, suggesting potential long-term detriments to bone mineral density.
• ⏳ While improvements in bone density can occur on a carnivore diet compared to a standard American diet, the insidious loss of calcium may take 10-20 years to manifest clinically.
• ⚠️ High animal protein intake, if not offset by buffering agents like bicarbonate, may also lead to kidney strain, evidenced by increased GFR and albuminuria in younger individuals.

Offsetting Acid Load

• 🥛 Consuming dairy like raw milk or yogurt can help neutralize some acid, but hard cheeses are highly acidic.
• 🦴 Consuming bone meal can provide calcium and some buffering substances, but may not fully offset the acid load from a high protein diet.
• 🥦 Low-oxalate fruits and vegetables can help, but require much larger quantities to fully neutralize the acid load from animal foods.
• 💡 For optimal health, especially when consuming significant amounts of animal protein, supplementing with bicarbonate is recommended to mitigate the effects of acidosis.