Will I Gain the Weight Back After Keto?
Quick answer: You can, the same way you can after any diet. What brings weight back isn't the word "keto" leaving your life; it's the habits that leave with it. Trials show low-carb diets often lead early and then the gap narrows by about a year, which says more about people drifting back to old eating than about the diet itself. The first few pounds that come back when you add carbs are mostly water, and that part isn't fat.
On this page
- The water comes back first, and that's fine
- What actually brings fat back
- How to leave the weight-loss phase on purpose
- What the research says
- KetoDick's take
- When to involve your doctor
- Key takeaways
- Related
The water comes back first, and that's fine
Start with the part that scares people most. You eat carbs again, and a few pounds show up overnight.
Here's why. Your body stores carbohydrate as glycogen, and each gram of glycogen holds water. KetoDick uses the two-to-one figure: for every gram of glycogen you lose, you lose about two grams of water (video cTGYIFOTPl8). In his basics video he puts the total at about 700 g of glycogen plus 1,400 g of water, around 4.4 lb (video UygKGoP_BtA).
So when carbs come back, so does some of that. It's refilling a tank, not regaining fat. If you know it's coming, you won't panic, and panicking is what sends people into a spiral. See water weight.
What actually brings fat back
Fat comes back the way it arrived: slowly, from eating more than you use for a long time. KetoDick reminds people that most of them gained gradually, a few pounds a year, and that it won't reverse instantly (video cTGYIFOTPl8). The same is true in the other direction. Regain is rarely one bad weekend. It's months of small drift.
His case for keto rests on adherence. Cutting carbs turns hunger down, so you eat less without white-knuckling it (video 9AGpKAfs3Yk). The flip side is obvious once you say it: if the hunger control came from low carbs, and the carbs come all the way back, so does the hunger, and so do the old portions.
That's why the useful question isn't "will I regain after keto?" It's "which habits am I keeping?" The ones that matter are the ones he keeps returning to: meal prep, shopping, knowing your carb dose, tracking when things drift (video f119qGyJ7AY).
How to leave the weight-loss phase on purpose
He splits keto into phases: an introductory phase, a weight-loss phase, and maintenance (video NUJNFG6lLWw). Maintenance isn't "stop keto". It's a different setting.
So what you do when you reach your goal:
- Eat more food, mostly fat. In maintenance he says dietary fat has to come back up, to roughly 70 to 75% of what you eat, with more total food (video NUJNFG6lLWw). You're no longer pulling energy from body fat, so it has to come from your plate.
- Decide on purpose whether carbs return, and how much. He's open that some people may go back to more normal eating once background insulin is lower after weight loss (video uXzscHudgt0), and that he's unsure about very low carb for life (video uXzscHudgt0). If you add carbs, add them in measured steps, not all at once.
- Keep the kitchen habits. Meal prep, a short grocery list, and protein at every meal don't stop being useful when the goal is reached.
- Watch a weekly average, not a daily number. He tells people to look at weekly averages rather than daily targets (video UygKGoP_BtA). Pick a band, say a few pounds, and act when the average leaves it.
- Keep a re-entry plan. If the average climbs, you already know what works. Go back to the weight-loss setting for a few weeks rather than waiting for a crisis.
What the research says
The evidence pages here have several head-to-head trials. They line up on one pattern: low-carb often leads early, and the gap narrows with time.
- Foster et al. (2003): in 63 adults, low-carb lost more at 3 and 6 months, the difference was not significant at 12 months, and retention was low in both groups (Foster et al., 2003).
- DIRECT (2008): a two-year trial in 322 adults found mean losses of 2.9 kg on low-fat, 4.4 kg on Mediterranean and 4.7 kg on low-carb (Shai et al., 2008).
- Bueno et al. (2013): across 13 trials lasting at least 12 months, very-low-carb ketogenic diets lost 0.91 kg more than low-fat (95% CI −1.65 to −0.17) (Bueno et al., 2013). Real, but small.
- DIETFITS (2018): over 12 months, 609 adults lost 5.3 kg on healthy low-fat and 6.0 kg on healthy low-carb, not significantly different (Gardner et al., 2018). That trial's low-carb arm was moderate, not ketogenic.
- The National Lipid Association concluded low- and very-low-carb diets are not superior for long-term weight loss, though they may give more short-term loss (Kirkpatrick et al., 2019).
None of these trials tested what happens after people deliberately stop keto. What they show is that over a year, most people in any diet group drift, and the groups end up closer together than they started.
KetoDick's take
He frames keto as an intervention, something you may use for a period, and says the "way of eating" crowd expects keto for life while he's not so sure (video uXzscHudgt0). He's also not shy about the long game: it took years to get to your starting weight, so give the change time (video Ewo-C_Cc4hU).
Where he and the trials agree: diets mostly work if you stay on them. Where they differ in emphasis: he credits keto's hunger control with making staying on it easier (video 9AGpKAfs3Yk), while the year-long trials don't show much difference in where people end up. Both can be true. Keto may be easier for some people to keep, and anyone who stops keeping it drifts back.
When to involve your doctor
If you're on diabetes or blood pressure medication, tell your doctor before you add carbs back. Your doses may have been lowered on keto, and adding carbs changes your numbers again. If your weight loss involved long stretches of deliberate restriction, or you have an eating-disorder history, a doctor or therapist is a better partner for maintenance than a calculator.
Key takeaways
- The first few pounds after adding carbs are mostly glycogen and water, not fat.
- Fat regain follows dropped habits and returning hunger, slowly, not a single meal.
- Trials show low-carb's early lead usually narrows by 12 months.
- Maintenance is a planned phase: more food and fat, measured carbs, the same kitchen habits.
- Watch a weekly average and have a re-entry plan before you need it.
Related
- Guide: Maintenance · Transitioning off weight-loss keto · Maintenance habits · Water weight
- Blog: Is keto sustainable long term? · Keto as a way of eating · Why do most diets fail? · DIETFITS explained · What happens if you cheat?
- Videos: Eating too much fat on keto · Exercise, cheating and way of eating · Beginner keto questions