Quick Summary: The slow carb diet limits dairy because of lactose, the milk sugar that spikes insulin. But not all dairy is equal. Cottage cheese, plain Greek yogurt, aged hard cheeses, butter, ghee, and heavy cream are all lower in lactose and work in moderation. This guide covers what Tim Ferriss actually says about each one, plus what a decade of cooking and eating this way has taught me about what holds up long-term.
Jump to: Complaints about Dairy and Slow Carb | Ferriss and Rules | The Lactose Component | Cottage Cheese and Greek Yogurt | Coffee Creamers, etc. | Hard Cheeses | FAQ
Dairy was the most consistently confusing part of the slow carb diet for the 400+ clients I coached on this diet. Tim Ferriss says to avoid dairy, then carves out exceptions for cottage cheese, cream, and ghee, and says nothing about Greek yogurt or hard cheeses that became mainstream after his book was published.
The nuance matters more than the blanket rule. The issue with dairy on slow carb isn’t fat or calories, but rather it’s lactose. Lactose is milk sugar and acts on insulin the same way other sugars do. Some dairy products are low enough in lactose to work. Others aren’t. Here’s how to navigate it.
If you are just getting started on the slow carb diet, a good place to start would be getting familiar with this slow carb diet food list, which includes allowed foods, domino foods, and forbidden foods.
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Common Complaints About Slow Carb Diet Rules
Ferriss has done some experimentation for you concerning dairy and the 4-hour body diet, but remember that our physical bodies are unique and complex.
Tweaking any diet is going to be necessary to achieve a long-term, sustainable way of eating that will fit your exercise intensity, your sleep routines, and your overall lifestyle.
As a previous coach on a range of low-carb diets, the most frequent complaints or confusion I heard around this “way of eating” was focused on these three issues:
- The degree of fat that is allowed
- The type of fruit that is allowed
- The type of dairy that is allowed
What Tim Ferriss Says About Dairy
Before I give you my interpretation of how dairy fits into a slow-carb (and low-carb) diet, I want to quote the author of the 4-Hour Body, Tim Ferriss.
This quote from his website discusses dairy as part of the 4-Hour Body Slow-Carb diet.
“Do not eat the following, except for cheat days:
– yams
– sweet potatoes
– quinoa
– diary (this includes cheese and yogurt of all kinds)
__Tim Ferriss
Ferriss goes on to say…
“I mention cottage cheese at one point as a last resort. It is low in lactose, which is what you need to avoid. Ghee and cream (for coffee) should contain little or no lactose, hence you can use them. The same goes for effectively lactose-free, unflavored whey protein, etc..”
__Tim Ferriss
Many nutritionists will tell you that any diet that excludes an entire food group is faulty. This seems logical and valid if we are talking about a long-term, sustainable diet.
However, for short-term weight loss, or to kick-start a lower-carb lifestyle, try to avoid three food groups for a while: fruit, grains, and dairy. Save them for cheat days.
Now, while simple rules are easy to follow and give you a great boiler-plate for initiating a high-protein-low-carb diet, the devil is in the details after you get going.
Getting the details right for you is particularly true if you want to make this way of eating a lifestyle change rather than a short-term diet.
The rest of this post is my interpretation of how dairy and the 4-hour body diet work for fat loss.
Want more information? See this post to learn more about the similarities and differences between Low Carb, Slow Carb, and Keto diets.
Why Lactose Is the Issue
The bottom line on dairy is you want to avoid lactose, which is also called milk sugar and acts on insulin in the same way as other sugars.
That said some dairy products are made in a way that limits lactose. This would include aged hard cheeses, butter, and cream (note that they may be dense in calories even if low in lactose).
Some dairy products, such as cottage cheese and plain Greek yogurt, are allowed in small amounts, or intermittently because they are very high in protein even though they contain some lactose.
Cottage Cheese on Slow Carb
The process of making cottage cheese results in “almost” no lactose present at all. This explains why some lactose-intolerant folks can happily eat cottage cheese without a problem.
The lack of lactose coupled with the high amount of protein is why Tim Ferriss included it in the ‘grey area’ of slow-carb foods.
So, is cottage cheese compliant with the 4-hour body diet, or not?
Ferriss notes you can have 1/2 cup but not on an everyday basis. The answer comes down to what else you are eating daily, as well as individual experimentation.
Getting plenty of protein is one of the major keys to success, so if you’re in a tight squeeze or can’t tolerate other high-protein foods for breakfast, then cottage cheese is a better choice than limiting protein.
However, including it in a daily meal routine could mean slowed fat loss.
I have used cottage cheese once or twice a week without any weight gain (note that I have already reached my goal weight however, and have been stable for years).
My daughter, who is on SCD, regularly eats cottage cheese with spicy salsa and is continuing to lose weight.
Experiment with your own body concerning cottage cheese.
Greek Yogurt on Slow Carb
You do need to avoid flavored yogurts and many people add fruit to Greek yogurt, which is not allowed on SCD and will up the sugar content quite dramatically. Plain Greek yogurt is going to be one of those things you will need to experiment with.
Comparison Chart: Cottage Cheese vs Greek Yogurt
| 1/2 Cup | Carbs | Calories | Protein | Lactose |
|---|---|---|---|---|
| Greek Yogurt | ~4 grams | ~50 | 10-12 grams | ~4 grams |
| Cottage Cheese | ~4 grams | ~60 | 11-13 grams | ~5 grams |
Greek yogurt has a slight edge over cottage cheese in terms of having more calcium, less sodium, and the addition of probiotics.
Bottom Line: From the horse’s mouth (the horse being Tim Ferriss): “In the end, the point of the 4-Hour Body is intelligent and responsible SELF-EXPERIMENTING“.
What About Half and Half, Lactose-Free Milk, and Coffee Creamers?
This comes up constantly, so it’s worth addressing directly.
Half and half contains lactose and will cause an insulin response, even though it’s less than skim milk. It’s not the worst offender, but heavy cream is a better choice. Heavy cream is higher fat, lower lactose, and more satiating.
Lactose-free milk has had the lactose broken down enzymatically, but it still contains the same amount of sugar; it’s just in a different form your body can process more easily. For slow carb purposes, it’s not a significant improvement over regular milk.
Coffee creamers, even sugar-free versions, often contain ingredients like maltitol or corn syrup solids that behave similarly to sugar. Read labels carefully and look at total carbs, not just the “sugar-free” label.
What About Half and Half, Lactose-Free Milk, and Coffee Creamers?
This comes up constantly, so it’s worth addressing directly.
Half and half contains lactose and will cause an insulin response, even though it’s less than skim milk. It’s not the worst offender, but heavy cream is a better choice — higher fat, lower lactose, and more satiating.
Lactose-free milk has had the lactose broken down enzymatically, but it still contains the same amount of sugar — it’s just in a different form your body can process more easily. For slow carb purposes, it’s not a significant improvement over regular milk.
Coffee creamers, even sugar-free versions, often contain ingredients like maltitol or corn syrup solids that behave similarly to sugar. Read labels carefully and look at total carbs, not just the “sugar-free” label.
The practical hierarchy for coffee on slow carb: heavy cream is best, unsweetened coconut milk or almond milk are acceptable alternatives, half and half occasionally (if you track it) lactose-free milk and creamers with caution.
What About Hard Cheeses Like Parmesan and Aged Cheddar?
Ferriss’s book doesn’t address hard cheeses specifically, which is why there’s so much confusion. The answer comes down to lactose content (again).
During the aging process, the lactose in cheese is converted by bacteria into lactic acid. The longer a cheese ages, the less lactose it contains. Aged hard cheeses like parmesan, aged cheddar, gruyere, and pecorino romano are nearly lactose-free as a result.
Soft cheeses, like ricotta, brie, mozzarella, cream cheese, retain more lactose and are closer to what Ferriss means when he says to avoid dairy.
The practical guidance: aged hard cheeses in moderate portions are unlikely to stall weight loss for most people. If you hit a plateau, cut them first and see if that moves things. If you’re in active fat loss mode, skip them entirely for the first month and reintroduce carefully.
A good list to keep handy for meal planning or going to the grocery store is this slow carb shopping list (includes protein counts).
My Takeaways on Dairy and Slow Carb
- Try your cottage cheese or Greek yogurt for a while, but make sure you’re getting 20-30g of protein with your meals.
- Dairy on the 4-hour body diet can work if close attention is paid to the type of dairy (minimal lactose) and the amount of dairy.
- The amount is watched primarily because dairy (like aged hard cheeses) can be very dense in calories.
- If you plateau on the diet, try ditching the dairy for a while. N=1 is often the best experiment (i.e. experiment with one person – you)!
FAQ
Tim Ferriss calls it a “grey area” food. You can have 1/2 cup occasionally, but not daily. The process of making cottage cheese removes most lactose, and it’s high in protein. If you plateau on weight loss, eliminate it and see if that helps.
Similar to cottage cheese: allowed occasionally in plain, unsweetened form. Avoid flavored yogurts, which contain added sugar. Don’t add fruit except on cheat day.
Yes. Heavy cream contains minimal lactose. Tim Ferriss allows up to 2 tablespoons of heavy cream per day in coffee.
Generally no. However, aged hard cheeses (like parmesan) are lower in lactose than soft cheeses. If you include them, watch portions since they’re calorie-dense. If you stall on weight loss, cut cheese first.
Both are allowed. Butter has minimal lactose; ghee has essentially none since the milk solids are removed.
The slow carb approach to dairy actually works well for lactose intolerance since it focuses on low-lactose options. Cottage cheese, Greek yogurt, aged cheeses, and ghee are often tolerated by lactose-intolerant people.
Plant-based cottage cheese made from almonds or cashews has been appearing in stores recently. These don’t contain lactose, which removes the dairy concern, but check total carbs and added ingredients carefully, as some versions add starch or sugar to improve texture. Compared to traditional cottage cheese they’re generally lower in protein, which matters on slow carb. Use them as an occasional alternative if you prefer plant-based options, but don’t treat them as equivalent in terms of protein content.
Ferriss doesn’t address hard cheeses directly, but the aging process removes most of the lactose. Parmesan, aged cheddar, and gruyere are nearly lactose-free and work in moderation for most people. If you plateau, cut them first. During active fat loss, it’s safest to skip cheese for the first month and reintroduce once you’ve established a baseline.
Dairy is not the only confusing part of the specifics of this diet. This summary of common slow carb diet mistakes will help you understand some of the other nuances of the diet that aren’t perfectly clear.
I meant *plain* Greek yogurt
Playing Greek yogurt has less carbs per serving than cottage cheese. So if one is allowed the other should be.
Yes, I agree. It’s just that Ferriss didn’t directly address yogurt in his book, whereas he did briefly talk about cottage cheese. I personally think plain greek yogurt is fine.
Hi,
This has been really useful. I have been following 4hb for some time now, but it seems whenever i get to a certain mark, it just becomes really difficult. The longer i am on it, without seeing results, the more discouraged i get. I still love the diet, because i think it is more sustainable, for me in the long term. I just wished i could lose the weight, and get on maintenance mode. For reference, whenever i am at 68-69 kgs, it just stalls. I have done this diet twice; once after my first pregnancy, and this second time, after my second pregnancy (and my second kid is almost 2!).
The thing about whipping cream vs lactose free milk. I checked my whipping cream and it has 6.8 gms of sugar in it per serving, compared to 2.9 gms of sugar per serving for the lactose free milk. I am gonna give the lactose free milk a try here.
Hi there, you are correct about the whipping cream having sugar/carbs. It does vary quite a bit by brand, but most of them are some percentage of “whole cream”. The one I get is 40% and that is the highest I have found. So, to be totally 100% compliant you would not use heavy whipping cream.
That said, I have found that it is more sustainable for many people to be 90% compliant rather than 100% as long as you do some serious tracking. Tracking is really the only way to truly know how your body is responding (I use myfitnesspal). In the end, if you are not losing weight and you are being 90-100% compliant, you will probably have to look at lowering your calorie count some (or increasing your exercise program a lot). Calories do matter on this diet and on the keto diet.
Another way to help weight loss if you are not losing and you are being 90% compliant is to stretch out your cheat days to once every 2 weeks rather than once a week. This can be effective also.
Best of luck to you. Just remember that every “body” is different and the absolute best way to troubleshoot how your body is responding to any diet is to track the variables. It doesn’t have to be forever, but if you can track things for 6 weeks you will learn quite a bit about where the diet is failing you.
Thanks a lot! I love cottage cheese and I can eat it as a side dish with almost everything. What makes it though for me to follow Ferriss’ slow carb diet is that legumes are mandatory. My stomach does not like large amounts of legumes.
Michael, I wouldn’t look at it that legumes are mandatory, but rather that a certain amount of protein is mandatory. He got a lot of his protein from legumes and 1 cup of beans per day is recommended from the Blue Zones study, but it is more important that you get 20-30 grams protein per meal and that it is surrounded by vegetables with a wide range of micronutrients. He recommends a glass of wine per day also, but admits that is just because he likes wine and it won’t hurt. I would look at legumes the same way. In the end Ferriss always recommends that you test things on your own body and design around that.
Very useful details, thank you Dorothy!
It’s my 8th week of slow carb diet ?
Way to go Dmytro!! It’s definitely my favorite diet in terms of fat loss and sustainability!
My goals aren’t weight loss, but having more energy, fewer cravings and putting on some muscle. Having some SCD meals has been good for energy and cravings.
I’m far from strict about it and I do eat dairy. I don’t eat much meat or eggs, which restricts my protein options a lot.
It sounds like dairy probably isn’t a big problem for me, as long as we don’t go too hard on the hard cheeses. Good to know, thanks!
Chris, the biggest “rule” of all is to experiment on your own body and find the mix that is sustainable, healthy and leads to permanent lifestyle change. Sounds like you have found that!
As a lover of all things dairy this diet always intimidated me but this information makes it much more accessible thank you!
Well that’s great to hear Ryan! It’s really important to customize this diet stuff so that it can be a sustainable lifestyle.
That’s really useful info, Dorothy! As a non-meat eater with an intolerance to nuts and seeds, I really struggle with reducing carbs in my diet but I love greek yoghurt and I’m happy to eat cottage cheese so that’s something I can feel a bit more positive about 🙂
Yes, it is a little more challenging for non-meat eaters to get in high protein foods. There is a really good book out right now on keto for non-meat eaters. It is primarily around a plant-based diet but does include fish and eggs. It’s called Ketotarian, by Dr. Will Cole. Highly recommended!
Thanks Dorothy, I’ll check that out!
Hi Dorothy,
I used the SCD per the 4 Hour Body book a few years ago – supplements included – and had great results, losing about 25 lbs in 31 days, even though I didn’t stick to the plan religiously (i.e. regular sugar free candy, dark chocolate, coffee creamer, stevia, and occasional cheese and fruit).
Since then I had to take Prednisone for about 5 straight years (due to autoimmune disease), and as is typical for long term Prednisone use, I gained a lot of weight from the related body fat increase; over 70 lbs despite exercise and diet changes. Now that I am FINALLY off of the Prednisone, I have been trying to get rid of the excess fat I gained. So I am going back to SCD, but considering my health issues – lung disease caused by Polymyositis/Dermatomyositis (autoimmune disease) and Bile Reflux Gastritis – my specialists do not want me on any supplements 🙁 . Additionally, I need to try to avoid inflammatory foods and some bile gastritis aggravating foods, but that includes SCD foods that were staples when I was previously on the diet.
The past few months I tried eating anti-inflammatory foods (ex: sweet potatoes, plantain, veggies, lean meats, fish and fruits), quinoa, greek yogurt and almond or pea milk, some exercise such as walking/hiking and yoga, and restricting calories but the weight hasn’t really gone anywhere although I did seem to lose a barely noticeable amount of fat, and I had significantly less joint, muscle and stomach pain/issues.
So I am trying to figure out how I can go back to SCD with anti-inflammatory food adjustments, without sacrificing fat loss? From what I have been told or read, between the bile gastritis and autoimmunity, I need to try to avoid: nightshade veggies, legumes, eggs, nuts. This really limits me as to what is left to eat on SCD. So is there anything I can use as valid low carb, low glycemic replacements for these foods? My primary goal is fat loss – as long as I can do that, then actual weight doesn’t really concern me (since I would be trading fat for muscle).
Any ideas or insights would be greatly appreciated!
Michelle I am sorry to hear of your very challenging journey. It is much too complex for me to comment with any confidence on a blog message. There would be a lot of trial and error involved to customize something that would work for you. Since you had success on slow carb before that would be a good place to start tweeking.
What about a little 1/2 & 1/2 in your coffee?
1/2 and 1/2 has sugar (in the form of lactose). It’s not as much as skim milk and the others, but it is still sugar. Heavy whipping cream is the way to go. Not only does it avoid the sugar/insulin issue but it keeps you satiated much longer and it doesn’t take very much for a rich cup of coffee. Similar to what the bulletproof coffee people do by adding butter or coconut oil to their coffee.
You do need to be careful not to overdo however. 2 Tablespoons heavy cream a day is recommendation.
What about lactose free 10% cream, is that ok ? It is only 20 calories and 1.5 gram of fat
The thing you want to look at on the nutritional analysis of the label is the sugar content. Compare your dairy based on sugar. In general low-fat dairy has more sugar. High fat dairy without the sugar won’t cause an insulin response that results in storing fat. Yes, it is more dense in calories, but if you use it sparingly you will stay full and productive longer without spiking blood sugar. High fat dairy is the way to go if you are keto. If you are watching calories, just use less, but the best thing to do is read and compare labels for sugar content.