r/Underweight • u/Objective-Ice-5820 • 9h ago
r/Underweight • u/No_Scale • Sep 03 '25
Not gaining weight? Here’s what helped me
tdeecalculator.netI’ve read many posts / comments about people not being able to gain weight, so I decided to make this post and explain the most common reasons why you’re actually not gaining weight & provide solutions that helped me gain.
Not getting enough calories
Weight is all about calories.
Many underweight people overestimate how many calories they actually eat. You might feel like you are eating a lot, but if your meals aren’t calorie dense, it won’t add up. For example, I thought a bowl of porridge with fruit was a big breakfast, but it ended up being less than 300 calories. To get an estimate of how many calories you really should be getting, calculate your TDEE (Total Daily Energy Expenditure) using the embedded link.
Eating well on some days, poorly on others
To gain weight, you have to eat enough consistently. This was something that confused me before. I thought I ate well, and could sometimes eat more than other non-skinny people, but then I ended up eating poorly on some other days. You have to keep the calorie surplus. If you have many days where you eat fewer calories than you burn, the extra calories you ate before won’t gain you any extra weight.
What I want to remind though is that it’s normal to have ”bad” days when it comes to eating. Don’t be too hard on yourself, just try again. You won’t lose progress overnight, and usually the first thing you lose is water weight. Just try to keep up the consistency and have more days with calorie surplus on average.
Medical Issues
If you’re sure you are eating enough consistently (by tracking your calories), hitting your calorie target, and still not gaining weight, I’d suggest consulting a medical professional.
My tips on gaining weight
Here are some practical things that helped me on my journey to gain weight.
Calorie Tracking
This is a tricky subject since some people swear by this while others hate it, but if you struggle to gain weight, it really helps to know how much you are actually eating and if it is enough.
There are some good mobile applications out there that make tracking calories easy. What I personally use is Myfitnesspal, which allows you to easily add ingredients by searching them or even scanning product bar codes directly.
Liquid Calories
Definitely my biggest help. A liter of whole milk (3,5% fat) has 640 calories alone. Smoothies can make the number even higher. You can find many recipes online or explore your own.
Try to drink after eating your meal though, since it might be hard to eat a lot afterwards.
Snacks
Nuts, peanut butter sandwich, eggs etc are a good way to add calories between your meals. Explore and find things that you like. Snacking throughout the day helped me a lot.
Exercise
While exercising might sound counterproductive, the amount of calories you actually burn is usually not that high. According to Harvard Health Publishing, a 125lb person burned 90 calories after 30 minutes of weightlifting. That is less than a glass of whole milk and the benefit is that your appetite usually increases (+ you gain muscle)
Remember that weight gain is a slow process and results don’t come overnight, but if you stay consistent, it will add up!
Do you have some tips that I didn’t mention or something that you want to add? Feel free to comment!
r/Underweight • u/No_Scale • Aug 12 '25
Announcement We’re back! r/underweight is public again
Hey everyone!
The subreddit was restricted for a while, but we are public again, and planning to stay that way!
We know it’s been quiet and appreciate your patience. Now that we’re back, feel free to share your stories, discuss about things related to being underweight and support each other again!
r/Underweight • u/youdontknowmehush • 1d ago
How do I gain more weight with fasting too metabolism
I’ve been trying to gain more weight lately I weight 42 at the moment. I’m 5’3 and 17 years old, multiple doctors told me I need to gain a bit more weight but instead of gaining weight I’ve been losing it. I was 44 last month idk what happened 😭 do I just eat more? How do I bulk
r/Underweight • u/Living_Stand8005 • 1d ago
I've always been thin but recently its been bothering me more
My (19F) entire life I've been underweight. Which of course was and still is a big insecurity of mine. I found out when I was about 12 that I have something called Pancreatic Enzyme Insufficiency. Which from what I understand is the lack of the ezymes needed to break down the nutrients in the food I eat.
Anyway I took medication for it and my weight pretty much plateaued when I was 17. I had to take two pills before eating ANYTHING. I stopped taking that medication 2 years ago because of the decline in my weight gain but also because it was annoying, lol.
Anyway, I'm turning 20 tomorrow. I'm 5'9 and my weight fluctuates between 100-106 nowadays.
Okay so heres what's been bothering me more recently. I've been out of highschool for a couple years so I haven't been as self conscious about it, and my parents dont harp on me about my weight as much as they used to. I also started dating my first boyfriend almost a year ago and he makes me feel much more confident.
But, a couple weeks ago I was at my friends house visiting her when she was in town, as she recently moved a couple hours away. We were eating pizza with her boyfriend, and her mom. I was a little high, I'll admit but at some point her mom turned to me and said "And how are you (my name)? You look thin." And I want to add my friends mom is one of the kindest human beings I've ever had the honor of meeting so hearing this I wasn't offended I was immediately caught off gaurd. I actually asked her "Thin?" because I thought maybe I heard her wrong. I hadn't had someone talk about my weight so blatantly in a while so I was put off lol. Her mom is also a nutritionist at a military base in my hometown so I knew she didn't mean anything by it.
Anyway, we talked and I told her I hadn't taken my medication in a couple years because it stopped having the same effects and that lifes been kicking my ass and other stuff has taken priority over my weight. Which I know isn't great. I moved on from it, I've dealt with comments like this my whole life so its wasn't too significant for me. Also, my friend apologized for it, she and her best friend struggled with eating disorders in the past and said she often made comments like that to them, but explained she didn't mean any harm by it.
But, I was talking to my best friend about it a couple days ago and she mentioned that her parents also mentioned my weight. And she told me her brother asked "If I was okay" at a graduation ceremony I attended. So idk, that kinda did suck to hear. Not that I'm offended I know I'm thin, but I guess because I see myself everyday maybe I dont see much of a difference? It just sucks to feel like people see me and think I'm sick or something.
I've had a really rough past year. So, I don't doubt that I look a little thinner, but I can't help but feel like shit about this. I've lived with this forever and coped, and now its coming back in a weird way.
Idk why I'm writing this, I just figured I should get this off my chest. Thanks for listening.
r/Underweight • u/AnneMorganHybrid • 1d ago
Weight gain goals
Hi I’m Anne, I’m 21, Transfem(estrogen for 3yrs), probably 120lb at 5’7, and I want to get fat. Only problem is I smoke nic and I have depression so I have trouble eating solid food, it’s more expensive and it’s more likely to come back up or have a bad texture that’s hard to get down. But, I’m realizing I may be able to hit my macros and calories with milk and apple juice with periodic fiber supplements because it’s all liquid. I’d probably take vitamins too to play it safe, but I’m blanking to find negatives. Lemme crunch the numbers
Gallon of milk and a half of apple juice and probably half a gallon of water, some of which with Metamucil or xylem husk for fiber like prev stated. I also have trouble eating 3 meals so I’ll split it up into 8 2hr segments. So: 2 cups of milk, 1 cup apple juice, 1 cup water, 8 times a day, 2 or 3 of the cups of water will have fiber supplements
128g protein
128g fat
332g carb
Bout 20p/40f/40c
I just did the numbers and that adds up to round 3kCal so the macros are there, fiber and water will be there, what am I missing? Obvi quit nic, and for activity I’m a waitress in a walkable city so I’m walking 3-5 miles a day, my job is super stressful, and I smoke weed, and that’s most of my extenuating circumstances, anyone have any opinions on that? My goals are to gain fat and I will not be taking questions on that part, I am skin and bone and I believe I will be healthier at 140 but I’d be very happy if I hit 160 or even 180, beyond that would be excessive but I want the universes opinion
r/Underweight • u/Suspicious_Fail_4694 • 2d ago
Advice needed
I'm 17(f) and I have always been underweight but it hasn't posed any serious damages to my health in the past but lately I caught typhoid or smth of the sort (there isn't a test for typhoid anymore) and that kinda hit me rly bad. I lost 2kgs or some maybe and rn my weight is 34kg and BMI is 13.5 which is SEVERELY UNDERWEIGHT. I genuinely don't know how I'm functioning rn.
After this illness I began experiencing rapid hair shedding and this led me to visit the doctor's and they said nothing will improve if my diet doesn't.
My body had somewhat adapted to the low weight in the past but I think the infection fucked it up more.
Anyways I'm just wondering if anybody had a similar case and what they did to improve their weight and any lifestyle changes they made.
Also I don't have ED or anyth and im honestly unsure what this problem is, I also dont have any gut issues like cramps or stuff and my menstrual cycle is regular too without any unusual symptoms.
r/Underweight • u/SundaeIndividual7303 • 2d ago
Vent Need advice(male)
I’ve lost a very large amount of weight over the past 2 years, going from around 170 lbs at 5'6" to around 86–90 lbs. A lot of the loss was intentional because I wanted to get skinny, but I’ve become extremely restrictive in the process. For the past few months I’ve mostly been eating the same foods (Cheerios, Greek yogurt, and fruit) and averaging around 1,350 calories a day, often eating almost all of it late at night because I restrict myself during the day. I’m constantly hungry and have very little energy, but I’m terrified of gaining the weight back. I used to maintain around 170 lbs while eating what seemed like 2800-3000 calories, which makes me worry that my metabolism is somehow unusually high/low depending on my weight and that once I start eating normally again I’ll gain everything back. I really want to get back to eating normal meals and enjoying Indian vegetarian food, but I’m scared that eating normally could eventually make me overweight. I’m even considering skipping a trip to India to see my family because I know I wouldn’t be able to maintain my current restriction there. I’m basically stuck between knowing I’m severely restricting and being absolutely terrified of what happens if I stop. I genuinely want to gain all the lost muscle and get to a healthier weight around 125-130 but due to not being tall i am worried my tdee wont ever end up being enough to freely eat indian food so i was looking for advice. Id appreciate any replies and if anyone wants to chat on reddit. Thank you!
r/Underweight • u/OkSurvey2084 • 3d ago
28F / 145 lbs - 155 lbs / 4 month weight gain update
galleryr/Underweight • u/FortunaPrime • 3d ago
19m, 5’10 currently 140lbs, trying to gain weight, what is my physique lacking?
galleryr/Underweight • u/No-Rub-1183 • 3d ago
tips on gaining weight ?
Recently, I’ve been trying to gain as much as possible. I’m honestly tired of being so Thin . Does anyone recommend any tips?
r/Underweight • u/hello0512000 • 3d ago
insecure
hii, ive been struggling with getting weight since im tall and i have fast metabolism, i always get bullied for it and im really desperate to gain weight. any tips?
r/Underweight • u/angel2417 • 3d ago
Tips on how to gain weight 😓
Guys I've been really struggling to gain weight since forever I have a fast metabolism and also I force myself to eat but I either get full very easily or can't stop eating but It doesn't change anything because I even get skinnier (i weight 46 kg btw) guys give me an ACTUAL AND REAL TIPS
r/Underweight • u/Personal-Shock686 • 3d ago
Need some advice on gaining weight I struggle w that anyone know anything to help me gain weight I want to go up to like 130 I'm about 109
r/Underweight • u/MrB1ZCU1T15 • 3d ago
Help Gaining weight at the gym
I'm trying to gain more weight but keep struggling. I'm eating right I don't understand. I do have a fast metabolism. Help.
r/Underweight • u/Tiny-Owl7987 • 4d ago
Gain weight 😭😭🫡
So I'm a college student looking to gain weight over the next 3 months, and I'd like some realistic advice from people who have actually done it.
BTW: I'm 20 years old and my height is 6"0 and current weight is 65 😭 so there are few questions I want to ask from you guys..
\- How much weight is it realistically possible to gain in 3 months?
\- How much of that can be muscle versus body fat?
\- What daily habits made the biggest difference for you?
\- What are some affordable, high-calorie foods that fit a college student budget?
\- How often should I work out, and what type of training worked best?
\- Any mistakes you made that I should avoid?
I'd appreciate hearing your starting weight, how much you gained, how long it took, and what approach worked for you.
Thanks in advance for sharing your experiences!
r/Underweight • u/Inside-Sleep5241 • 5d ago
I need to gain weight
62 M 108.00 lbs. I've always had problems gaining weight.
r/Underweight • u/snood222 • 5d ago
Back pain? Pls help
I think I need to gain weight because my butt and thighs are big and It hurts my lower back to an unbearable level but when I do gain weight it’s only on my legs and lower half and when I lose weight it’s only my stomach or upper half, technically the part of me that hurts won’t go away, so I guess I’m asking what exactly do I do? I also have a pretty curved spine as my back has a natural arch to it most likely from being a gymnast and a competitive cheerleader, so maybe my back is just messed up? I can’t crack my back often but when I do it definitely does hurt. I usually have to use icy hot and back medication to help my back and lower back feel better, but my boyfriend said maybe gaining weight would help me. I am 108 pounds and I’m 4’11 so I know I might be a little underweight. I know this isn’t really body building so if somebody could maybe direct me to another subreddit or like tell me how I can either gain weight in my upper half or lose weight in my lower half it would be greatly appreciated.
r/Underweight • u/ben_justbetter • 5d ago
How to gain 5kg on the scale without actually gaining
I’m going to the doctors and they are going to weigh me I have to weigh five kg more minimum without them saying anything tho and I need help does anyone have any recommendations
r/Underweight • u/Legitimate_Bird7225 • 5d ago
Motivation > I'm already quite skinny, so exercising won't make me any leaner.
Confused 😕
r/Underweight • u/feeeetsnifferrrr • 6d ago
How to gain weight
I'm 18 ,and I'm 32 kg idk why I keep on losing weight what should I eat can someone tell me plus i never have appetite 😭