Keto made easy

Should You Weigh Yourself in the First Month of Keto?

Quick answer: You can, but the number won't tell you much. In the first month most of what the scale shows is water leaving with your stored carbohydrate, then a stall while your body adapts. So skip the scale for the first 30 days, weigh weekly or every two weeks after that, and give the diet a full 60 days before you decide whether it's working.

In this article

Why the first-week drop is mostly water

Your body stores carbohydrate as glycogen, and glycogen is stored with water. KetoDick puts the ratio at about 2 grams of water for every gram of glycogen, "2:1 or greater" from the video (uDw65ERtsA0). When you cut carbs hard, you burn through that glycogen in the first few days, and the water goes with it.

He gives the numbers as roughly 700 g of glycogen plus 1,400 g of water, about 4.4 pounds (UygKGoP_BtA). He also says those are male figures and that women should scale them down by about a quarter to a third (1vyxuWlxT5M). In his week-one schedule, most people drop about three pounds of water, and heavier people may see seven to ten (uDw65ERtsA0).

Here's the catch. That water comes back almost as soon as you eat a high-carb meal again. So the big first-week number is real on the scale, but it isn't fat, and it isn't a promise about week two.

Why weeks two and three look like nothing is happening

After the water drop, most people stall. KetoDick calls weeks two and three "a slog" (from the video): your gut bacteria are adjusting to fewer carbs, which can mean stomach upset, and you're not fat adapted yet, so energy is low (uDw65ERtsA0). In his longer live video he says you're "not really on the diet" until week three, four or five, and that how you feel on day 10 doesn't tell you much (cTGYIFOTPl8).

If you weigh every morning through that stretch, you'll see a fast drop followed by two flat weeks. That pattern is normal. It's also exactly the pattern that makes people quit in week three.

The arithmetic: how much fat can you lose in a week?

A back-of-envelope check helps here. In a tightly controlled metabolic ward study of 19 adults on reduced-calorie diets, people lost about 53 grams of body fat a day when the calories were cut from carbohydrate and about 89 grams a day when they were cut from fat (Hall et al., 2015).

Take the bigger number and multiply by seven days: 89 g × 7 = 623 g, a little under a pound and a half of fat in a week. The smaller one gives 53 g × 7 = 371 g, under a pound. Those were people on a ward with every meal measured. So when the scale says you lost six pounds in your first week, most of that can't be fat. It's the glycogen water from the section above.

What to track instead in month one

Month one, in KetoDick's framing, is a learning period: labels, shopping, recipes (starting-keto). The useful measures are the ones that tell you whether you're doing that well:

When to start weighing, and how often

His schedule: don't look at the scale for the first 30 days, then weigh week by week or every two weeks once month two starts (uDw65ERtsA0). From around week four, he describes normal fat loss as about half a pound to three pounds a week, depending on how big you were when you started and how you ate before (uDw65ERtsA0).

Even then, single days lie. A day-to-day jump of a few pounds is usually water and digestion (gained weight overnight). Weekly averages are kinder and more accurate (how often to weigh yourself).

If you have a history of disordered eating, the scale can be more than a measuring tool. KetoDick's advice in that case is to involve a therapist and a doctor, not to white-knuckle it (xyEZL0HuejI).

What the research says

The trials back up the "judge it over months, not weeks" part. In one early randomised trial of 63 adults, the low-carb group had lost more at 3 and 6 months, but the difference was no longer significant at 12 months, and many people in both groups dropped out (Foster et al., 2003). In DIETFITS, 609 adults followed either a healthy low-fat or a healthy low-carb diet for 12 months and lost an average of 5.3 kg and 6.0 kg, not a significant difference (Gardner et al., 2018).

Notice the timescale. Those are averages over a year. Six kilos is about 13 pounds in 12 months, which is far less dramatic than a first-week water drop and far more honest about what fat loss looks like.

The ward study above (Hall et al., 2015) measured fat loss in grams per day. None of the evidence pages measured the first-month scale experience of people starting keto at home, so the week-by-week schedule here is KetoDick's description, not a trial result.

KetoDick's take

He uses his day job here. As a data analyst and consultant, he tells clients to watch key performance indicators, the numbers that will actually change a decision. Weight in the first month isn't one of them, he says, and neither is the calorie count, because the benefits of ketosis mostly aren't there yet in the first 30 days (xyEZL0HuejI).

His fair-trial rule: give it a full 60 days. After that, if you're not seeing results or you don't like eating this way, you've given it a decent try (uDw65ERtsA0). He also warns that social media can do more damage than the scale, because people post their most dramatic results, and next to those your average day looks like failure (dNUvzMl-OEU). And he posted his own five-pound gain day on purpose, because nobody posts those (f9P8BPWHc4U).

Key takeaways