Your deuterium load is determined by the ratio of carbohydrates vs. fat in your food, along with the deuterium content of the water. Eat at least 50, 60% fat from grass-fed butter, tallow, ghee, or fat, the rest from proteins, and very little carbs Tristan Scott: "If I eat a piece of grass-fed meat that's like 130 ppm, is it just going to produce like 130 ppm metabolic water, or is there kind of a variation? […]" Dr. László Boros: "So what you want to eat is the fat part fatty meat at least 50, 60% fat content, and the rest is proteins and very little carbohydrates. In the 118, 110 ppm range, that's the grass-fed natural butter and so on. Gábor's paper have this data. That's what can actually supply deuterium-free metabolic water in your mitochondrial matrix, because your glycolysis and your biochemical reactions can get rid of this much of deuterium, 118 ppm. I'm just giving you a number; it probably needs to be below 120 ppm. And grass-fed cow fat, tallow, ghee, those are in the 110, 100 ppm range. "So from this grass-fed, natural fat source you can produce deuterium free or very low deuterium, a few ppm matrix water, because your body has glycolysis and isomerases that can actually scavenge, that can actually get rid of deuterium from the fat-related intermediary metabolites, and also from carbohydrates somewhat. And because of these ratios, low carbohydrates are practically preventing deuterium to enter in your system. So it's not the deuterium content but how much of high and low deuterium containing substrates you consume. What's the ratio of carbohydrates vs. fat in your food? Practically, that determines your deuterium load, and what's the water deuterium content that you consume." Dr. László Boros with npub1yd2h2lrwchshvm46jq7auh65tjkxmgnapkavh7tjtqq07kknupxsa980tv @ 57:07–59:26 (posted 2023-11-28) https://youtu.be/U6nw_3m_k74&t=3427