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# How Much of a "Healthy" Food Is Actually Too Much? The Dose Question, Honestly
- URL: https://thatpaleochick.com/how-much-healthy-food-is-too-much-dose-question/
- Published: 2026-11-14T18:04:35.000Z
- Updated: 2026-11-14T18:04:35.000Z
- Description: Spinach, Brazil nuts, green tea, even bone broth, the foods we call "superfoods" can work against you when you eat too much of them. Here's what the evidence actually says about dose, and how to stop overdoing the good stuff.
- Author: Krista Wade
- Tags: Nutrition, Real Food 101, Paleo, Whole Foods, Food Myths, Nutrition Basics, Functional Medicine, Oxalates, Selenium, Green Tea, Bone Broth, Food Safety, Real Food Education, #toc

More is not always better. That idea might feel obvious when we're talking about doughnuts, but we really struggle to apply it to spinach. Or Brazil nuts. Or green tea. Or bone broth. We've collectively decided that if something is real, whole, and not processed, the volume dial can go as high as we want. That is a myth, and it trips up a lot of people who are genuinely trying to do right by their bodies.

## The Myth: Whole Foods Don't Have a 'Too Much'

The logic is understandable. Paleo, real-food eating is built on the foundation of removing ultra-processed garbage and replacing it with actual food. And when you've been eating that garbage for years, shifting to whole foods feels like a one-way improvement. It is, in a lot of ways. But somewhere along the line, 'this food is good' got quietly rewritten in our heads as 'more of this food is better.' It didn't.

Toxicology has a principle that goes back to the 16th-century physician Paracelsus: the dose makes the poison. Everything, literally everything, is toxic at a high enough amount and benign at a low enough one. The [National Institutes of Health Office of Dietary Supplements](https://ods.od.nih.gov/factsheets/list-all/?ref=thatpaleochick.com) publishes Tolerable Upper Intake Levels (ULs) for vitamins and minerals precisely because of this. Those ULs aren't set for synthetic supplements alone. They apply to nutrients however you get them, food included.

That's the gap I want to close here. Not to scare you off whole foods, because that would be absurd. But to give you a more honest picture of a few foods that real-food eaters specifically tend to over-rely on, and what 'too much' actually looks like for each one.

## Brazil Nuts: One a Day Is a Strategy. A Handful a Day Is a Gamble.

Brazil nuts are genuinely one of the best food sources of selenium on the planet. Selenium matters for thyroid function, antioxidant activity, and immune support, and a lot of people are under-eating it. So when real-food folks discover Brazil nuts, they go all in. A handful with breakfast, another as a snack.

Here's the problem. A single Brazil nut contains roughly 68 to 91 micrograms of selenium depending on where it was grown, and the [NIH's Tolerable Upper Intake Level for selenium in adults is 400 micrograms per day](https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/?ref=thatpaleochick.com). That means four to six Brazil nuts can put you right at or over the upper limit for the day. If you're eating a handful, you could easily be getting two to three times the UL.

Selenotoxicity, selenium toxicity, is real. Symptoms include brittle nails and hair loss, garlic breath (from selenide compounds leaving the body), nausea, and in severe cases, nerve damage and neurological symptoms. The [NIH documents chronic high selenium intake as a recognized clinical concern](https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/?ref=thatpaleochick.com). One to two Brazil nuts a day is a reasonable real-food selenium strategy. A daily handful is not.

This one matters especially in real-food and paleo circles because Brazil nuts get recommended constantly as a thyroid-support food, which they can be, at the right dose.

## Spinach and High-Oxalate Greens: The Kidney Stone Nobody Saw Coming

Spinach is essentially the official vegetable of eating healthy. And it is nutritious: folate, vitamin K, iron, magnesium. No argument there. But spinach is also extremely high in oxalates, compounds that bind to minerals like calcium in the digestive tract and can accumulate in the kidneys.

A [2021 review in the journal *Nutrients*](https://www.mdpi.com/2072-6643/13/10/3673?ref=thatpaleochick.com) confirmed that high dietary oxalate intake is a recognized risk factor for calcium oxalate kidney stones, which account for roughly 80% of all kidney stones. The researchers noted that spinach contains some of the highest oxalate concentrations of any commonly eaten vegetable. A single cup of raw spinach contains about 656 mg of oxalate. The commonly referenced 'low-oxalate diet' threshold is typically under 50 mg per day for people who are stone-prone.

Now, most people eating a reasonable amount of cooked spinach a few times a week are not in danger. Cooking reduces oxalate content somewhat, and the body is not helpless against it. But the green smoothie trend that became popular in paleo adjacent spaces, the ones built on two to three cups of raw spinach every single morning, stacks oxalate fast.

If you have a history of kidney stones, have been told you're a 'stone former,' or have any kidney concerns, this is worth talking to your doctor about. For everyone else, rotating your greens (arugula, romaine, watercress, cabbage, kale in moderation) is just smarter than loading one single green every day. Variety is a nutritional strategy, not just a culinary one.

## Green Tea: Real Food, Real Caffeine, and a Real Liver Warning

Green tea is legitimately well-studied. Research published by institutions including the [NIH's National Center for Complementary and Integrative Health](https://www.nccih.nih.gov/health/green-tea?ref=thatpaleochick.com) acknowledges that it contains compounds, particularly EGCG (epigallocatechin gallate), that have been associated with antioxidant activity. Fine. Good, even.

But here's what gets glossed over. The NCCIH also explicitly notes that high doses of green tea extracts, and to a lesser extent large amounts of brewed tea consumed consistently, have been linked to liver injury in case reports. The European Food Safety Authority published a [2018 scientific opinion](https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5239?ref=thatpaleochick.com) flagging EGCG intakes above 800 mg per day, which can come from concentrated green tea extracts, as raising safety concerns for the liver. That's the supplement form primarily, but it shows the dose principle at work.

For brewed green tea, two to three cups a day appears to be where most research lands as reasonable. The issue arises when people start stacking: brewed tea in the morning, a matcha latte at lunch (matcha is powdered whole-leaf green tea and significantly more concentrated than brewed), a green tea extract supplement in the afternoon, and maybe a 'detox tea' at night. Those layers add up to a genuinely large EGCG dose.

If you love green tea, keep loving it. Just count across the day and don't treat concentrated matcha and supplements as separate categories from your morning cup. They're not.

## Bone Broth: Protein and Collagen, But Also Lead

Bone broth became a real-food staple for good reasons. It's a traditional food found across virtually every culture. It contains glycine, proline, and other amino acids that support connective tissue, and it's one of the more soothing, nourishing things you can make in a pot on a Sunday afternoon.

But there's a dose conversation hiding inside the bone broth world that doesn't get enough airtime. Bones are a site of heavy metal storage in animals, particularly lead. A [study published in *Medical Hypotheses*](https://www.sciencedirect.com/science/article/abs/pii/S0306987713003387?ref=thatpaleochick.com) found that bone broth made from chicken bones contained meaningfully higher lead concentrations than plain water cooked under the same conditions, with organic chicken broth in one test reaching about 9.5 micrograms of lead per liter. The researchers raised the concern that frequent large-volume bone broth consumption could be a non-trivial source of dietary lead exposure.

This does not mean bone broth is dangerous. Context matters. One to two cups a few times a week as part of a varied diet is very different from drinking a quart of it every single day. The concern is greatest for pregnant women, young children, and people who are already monitoring lead exposure for other reasons.

If you make it at home, adding a splash of apple cider vinegar during cooking (which is already standard in most traditional recipes) may help draw out minerals, though it also draws out more lead along with the calcium and magnesium. Quality sourcing matters too. Grass-fed, pasture-raised animals generally have lower heavy metal accumulation than conventionally raised ones, though no food source can be guaranteed lead-free.

## The Practical Takeaway: Rotate, Vary, and Trust the Pattern More Than the Superfood

The body was designed, I genuinely believe this, to eat a wide variety of whole foods. Not to specialize in one single green, one single nut, one single broth. Traditional food cultures that maintained excellent health didn't have one superfood they ate in enormous quantities every day. They had variety, seasonality, and restraint built into the structure of how food was available.

The functional-medicine principle I keep coming back to is that the goal is a diverse, rotating real-food diet, not a maximized dose of any single nutrient from any single source. When a food is good, the right response is to include it. Not to eat it in unlimited quantities every single day forever.

A few practical moves:

**Rotate your greens.** Spinach one day, arugula the next, cabbage the next. Different nutrient profiles, different oxalate loads, more variety for your gut microbiome.

**Treat Brazil nuts like the potent food they are.** One or two a day is a thoughtful selenium strategy. Put the bag away after that.

**Count your green tea sources across the whole day,** not just the cup in your hand.

**Enjoy bone broth a few times a week** rather than by the quart daily, especially if you're pregnant or have kids in the house who are drinking it regularly.

None of this is about fear. It's about stewardship. The body is a gift, and real food is one of the best tools we have to take care of it. Using that tool well means understanding how it actually works, not just defaulting to 'more good food equals more good outcomes.'

That equation is not always true. And now you know some of the specific places where it breaks down.

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*This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.*

## Key Takeaways

- The principle 'the dose makes the poison' applies to whole foods, not just supplements or chemicals.
- Brazil nuts are so high in selenium that four to six can hit the NIH's Tolerable Upper Intake Level. One to two a day is the smarter move.
- Spinach is high in oxalates, which are linked to kidney stone risk at high intake. Rotating your greens is a nutritional strategy, not just a cooking tip.
- Green tea is well-studied and reasonable at two to three cups a day. Stacking brewed tea, matcha, and green tea extract supplements can push EGCG into a range that raises safety questions.
- Bone broth is a nourishing traditional food, but research suggests bones concentrate lead. A few cups a few times a week is different from a quart daily, especially for pregnant women and children.
- Variety and rotation are the real superfoods. No single whole food should dominate every single day.

## Frequently Asked Questions

### Can you eat too many Brazil nuts?

Yes. Brazil nuts are exceptionally high in selenium, and the NIH sets the Tolerable Upper Intake Level for selenium at 400 micrograms per day for adults. A single Brazil nut contains roughly 68 to 91 micrograms depending on growing conditions, so four to six Brazil nuts can hit or exceed that upper limit. Eating a handful daily over time is linked to selenium toxicity symptoms including hair loss, brittle nails, nausea, and in severe cases, nerve damage. One to two Brazil nuts a day is a reasonable approach. Source: NIH Office of Dietary Supplements, Selenium Fact Sheet.

### Is spinach bad for your kidneys?

Spinach itself is not inherently bad for kidneys, but it is one of the highest-oxalate vegetables you can eat. High dietary oxalate intake is a recognized risk factor for calcium oxalate kidney stones, which make up roughly 80% of kidney stones. If you have a personal or family history of kidney stones or have been told you're a 'stone former,' your doctor may recommend a low-oxalate diet, and large daily amounts of raw spinach would be worth discussing. For most people without that history, rotating spinach with lower-oxalate greens is a reasonable precaution rather than eliminating it entirely.

### How much green tea is too much?

Most research suggests two to three cups of brewed green tea a day is a reasonable and well-tolerated amount for most healthy adults. The concern with green tea at high doses centers on a compound called EGCG (epigallocatechin gallate). The European Food Safety Authority flagged EGCG intakes above 800 mg per day as raising safety concerns, particularly for the liver. That threshold is most easily reached through concentrated extracts or supplements, but stacking brewed tea, matcha (which is powdered whole-leaf tea and more concentrated), and a green tea extract supplement adds up faster than most people realize. Count across all your sources, not just your morning cup.

### Does bone broth contain lead?

Research, including a study published in Medical Hypotheses, has found that bone broth made from animal bones contains detectable levels of lead, since bones are a site of heavy metal storage. The concentrations found in that study were modest but higher than plain water cooked under the same conditions. This does not mean bone broth is dangerous for most people enjoying it a few times a week. The concern is primarily for pregnant women, young children, and those with elevated lead exposure from other sources. Quality sourcing (pasture-raised animals) and reasonable portion frequency are the practical takeaways, not elimination.

## Sources

- [NIH Office of Dietary Supplements: Selenium: Fact Sheet for Health Professionals](https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/?ref=thatpaleochick.com)
- [Nutrients (MDPI): Oxalate Intake and the Human Gut Microbiota: A Link in Kidney Stone Formation](https://www.mdpi.com/2072-6643/13/10/3673?ref=thatpaleochick.com)
- [NIH National Center for Complementary and Integrative Health: Green Tea](https://www.nccih.nih.gov/health/green-tea?ref=thatpaleochick.com)
- [European Food Safety Authority: Scientific opinion on the safety of green tea catechins](https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5239?ref=thatpaleochick.com)
- [Medical Hypotheses (Elsevier): The risk of lead contamination in bone broth diets](https://www.sciencedirect.com/science/article/abs/pii/S0306987713003387?ref=thatpaleochick.com)

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*This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.*