I am doing this diet with my doctor, so I will stick to it. For sure, going towards stability will be a big issue for me. But I hope I will be able to handle it.
I am a physicist, and I know what thermodynamics in open systems is. And I know energy is conserved. Of course, I sweat and all that. But on a day to day basis, there is no way sweat can account for 1kg.
So, I just wonder what is going on.
probably not … but your body can hang on to water…especially when it is stressed.
Why are you following this dietary path? Weight loss?
As a scientist I hope you realise that most calorie restrictive “diets” like weight watchers and slimming world follow a repeat business model.
You lose weight through starvation then regain it all and a bit more then start again.
I presume you are fully conversant with the “Biggest Loser” study?
Not a scientist but i used to date one at U of C. Lol. Anyways…just my own n=1 observation bc i have been on the weight loss train prepping for competitions, having to drop weight quick, getting the rebound wt gain, or taking a med and gaining weight on cals i did not gain weight on before with activity levels being the same or more…i.can lose more weight on a higher calorie level of keto than i could on non keto. My carnivore keto where i still drop is up to 2200,…on non keto i MAINTAIN at 1600 and put on weight with anything over that. A cal is not a cal. Why are u doing low cal with keto, physicist? Not a scientist…so take my 20 years of n=1 experimentation with my body with a grain of salt. https://m.youtube.com/watch?v=8elGLAnN57k
I am doing a PSMF.
So far, it seems “water retention” is the most reasonable explanation for the phenomenon described in this thread.
I agree, most likely just amount of water consumed varies from day to day. When you drink water, you instantly gain weight. Drink 1 kg of water, gain 1 kg of weight.
I have been monitoring my eating over the past few months after getting back to work after a 3 year “vacation”. Ive been paying attention because Ive been eating a lot of fast food. Mostly taco bell or cheese burgers. Stripped of their staches of course, no bread, rice, beand, or sweet sauces.
The calories a day was at 1300. Im a technician that drives all over a half dozen counties repairing office machine. Not much exercise.
That 1300 calories went on for a few months. I maintained my 195 pounds pretty consistently during that time. Plus or minus 1 or 2 pounds, but staying around the 195 mark every morning at weigh in.
The plus side to eating low cal is the body slows down energy use. That means it runs cooler. [edit: noticably cooler. I was cold. Summer in North Carolina is anything but cold. There were times I actually had my trucks heater on to counter the AC of the truck, I was uncomfortably cold] It doesnt have the extra energy to do the extra maintenance it otherwise would, which ends up as added heat in the system.
My calories were easy to calculate. My coffee was 500 calories from butter, coconut oil and HWC. The remainder was from lunch about 3 to 4 hours later. About 800 calories of taco bell or a 2/3 pound cheesebuger from Hardees.
I decided to change it up a bit, see what happens. I doubled the caloric intake in my coffee, to 1000 (from 500). Yes a 1,000 calorie coffee, and delicious 
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I slowly began losing weight. Went from 195 morning average to 190 morning avg. stayed there for 3 weeks. Last week I changed it up again and dropped my coffee back down to 500 calories and began to gain that weight back. Yes, eat less, gain weight. Eat more, lose weight. If you dont give your body enough energy to use, its going to use as little as possible and try to conserve as much as it can. Give it more, and it will find a use for it. I have eaten as high as 3,000 calories a day since becoming a Ketonian, without gaining weight. Eating less that 2,000 usually ends up in weight gain. The only esceotion is the occasional extended fast, ZERO CALORIES over several days, in which case fat burning kicks in for those days.
Take away… FASTING… the best low calorie diet to lose weight with. All other low calorie diets are a scam. Or somone is making money off it 
Because people eat more than their body requires!
You could probably live on one or two potato chips a day as an analogy, but one highly concentrated carbohydrate like a potato chip is not going to be very healthy micro-nutritionally nor is it going to fulfill your social eating habits and sounds totally illogical but that’s all you really need in reality, the more you increase your skeletal muscle volume while dieting, the least likely you are to gain it back in the fatty acid turn over pool because you want to oxidize the carbohydrate before it has a chance to become stored as lipid droplet in the existing adipose tissue.
Going back to the potato chip analogy, the more skeltal muscle volume you have, the more chips you can eat without gaining.
If you remember the Biggest Loser TV Show almost all the participants gained the weight right back again and remain that way to this day? (some even gained more weight back then when they started damaging their metabolism)
Why? Because they did not keep their skeletal muscle volume up (biceps and gluteus maximus) in contrast to when they went back to the way they were eating before? Not just discussing building muscle mass but working the mentioned extremities by providing resistance which controls your basal metabolic rate and resting metabolic rate (what makes you burn real body fat while at rest).
Another good example is that I have an elliptical cross training machine, it is superior for working the gluteus maximus besides weights. Most people do not know that this machine is designed specifically for the glutes and they use it wrong because they don’t arch there back and point/tilt their torso and butt outwards, so they really don’t get the benefit of really working the glutes on this particular machine!
My understanding is you have variance in your two vegetable meals, correct? This can cause differences in both water retention and inflammation both of which can influence day to day losses.
You are averaging a lb a day over those two days. Really nobody does any better than that so don’t fret over the variance.
I’m not at all worried about the whole calorie restriction slowing your metabolism thing. As of yet I haven’t heard you say what your daily calories actually are so I’m not even certain how restrictive they are but it’s clearly not starvation. Also, you haven’t said how long you will stay on this degree of restriction. As long as you aren’t hungry on your ketogenic diet I very much doubt you will have significant metabolic slowdown. However, at some point you will have to learn how to maintain your losses while eating real foods or you will eventually gain it back like you did the last time you tried this approach.
I wish you continued success.
Thank you very much @Ilana_Rose !
I do not know exactly how many calories I am eating per day, but I would say around 750kcal (plus minus 100).
Yes, I am not hungry (or better, much less hungry than before). Maybe my metabolism has slowed down … but if it is due to lower blood pressure, and the need to sustain less body weight, that is fine for me.
Yes, I will try to transition towards a stable and sustainable diet (I do not know when, I assume in 4-5-6 months’ time). For sure, it will be very low in sugars and simple carbohidrates. It will be relatively high in olive oil, avocados and fish. It will be moderate-to-low in protein.
But I still do not know if I will go towards a full keto diet, or if I will allow pulses. That is my main unknown so far.
750 calories actually sounds very low to me for a man, even dieting, to continue for that length of time. Can you tell us your size and height?
I think it might be wise to calorie and macro track for a few days. While some metabolic slowdown is fine as you lose weight you don’t want to have too much or it will lead to that “Biggest Loser” effect that others are talking about here.
1.75m, 90.6kg today.
Yes, I will try to consider this issue of metabolism, because it seems clear that reducing a few calories is hard, and just “losing” that via lower metabolism, is crazy.
Now my doctor allows me to eat meat or fish once per week. Yesterday I ate raw cod with tomato (yummie!), with a salad.
Note: the day my weight fell by 1kg is the day I ate fish for the first time … coincidence?
A small note: You mean complex carbohydrates simple carbohydrates are refined carbohydrates!
Yes! Low in simple carbohydrates!
No! “Very low” meant “almost nothing”. About complex carbohydrates … I do not know, this is my main question to myself:
I know sugar and simple carbohydrates are bad to me. Full stop. But are complex carbohydrates (legumes, whole cereals) also equally bad? For example, Valter Longo argues complex carbohydrates are needed for longevity.
So, could it be that restricting these complex carbohydrates is a bad idea?
I might experiment on that. I know exactly the effect sugars and simple carbohydrates have on me. But I do not know if eating say pulses have the same effect. I think I will give it a try, at some point in time.
I always go by amount of food eaten when it comes to complex carbohydrates!
I don’t count calories or use any reference guide or app, the reason for this is, is because I would become too dependent on looking at numbers rather than portion size! I eat very little in portion of each calorie (not junk food)! Our ancestors never did that nor do I!
If you ever observe how children eat (most of them, they eat very little)? I guess when we grow up we think we need to eat more food because we are bigger?
This is all based on correlation from epidemiological studies. It’s very, very weak science and only useful for hypothesis forming and not reaching any scientific conclusions. Valter Longo’s fasting research is very interesting but his conclusions about dietary composition are based on some very weak inferences. I don’t put any stock in them myself.
From my point of view, I take a “bayesian” approach: I consider statements which I “feel” are strong (even though I do not have enough knowledge to find out if these statements are really true or not). So, I take statements which are plausible to me:
One statement is the one of low carb. A second statement is what Valter Longo does.
When I read or hear both proponents, I tend to feel there is a lot of thought in it. So I would like to incorporate parts of both thoughts.
And in order to avoid mistakes, I also would like to diversify as much as possible, try to avoid methods which are too concentrated in something.
But I still have time to decide …
This does sound yummy! I wish that I could easily buy fish of a quality that we could prepare raw. But sadly I cannot 
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I do not know where you live, but in principle, dehidrated & salted cod can be maintained in good conditions for a long time (in fact, this kind of cod was the only way for many Spaniards to eat fish, before the invention of cars).
Then, you only need to “desalt” it again, and you have wonderful raw cod. Add a lot of olive oil, small pieces of tomato and maybe black olives, and you have a wonderful dish.
In fact, possibly this dish is my preferred way to eat protein of all.
Would you consider tracking your macros and calories for a few days? I know it’s a bother but you wouldn’t have to do it for long to get an idea of your true intake. You may be eating more calories than you think and it wouldn’t worry people here so much if it was a few hundred calories higher than you’ve estimated.
Also, it’s just a good idea to have this sort of information.
I tried desalting some salted herring once and it was still inedibly salty to me. Maybe I didn’t do it right. None of the fish sellers could give me information on how to do it. They sell it for immigrants who already know what to do and take no interest in learning about the product they are selling. Can you tell that it annoys me? I really like trying new things but couldn’t make the salted fish work 
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Nope. The Minnesota Starvation experiments showed that calorie restriction in the context of multiple carb-based meals/day with inadequate nutrients is terrible for metabolism.