Hinata Kato Has a Plastic Surgeon Check for Breast Augmentation and Explains the Twitter Controversy

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Overview

Fitness and diet YouTuber Hinata Kato made this video quickly in response to a wave of accusations on social media that their bust growth came from breast augmentation surgery rather than the training and self-care methods they promote. Kato's claim is that they increased their bust size on their own, at home. To support that, they visit MYCLI, a body clinic run by plastic surgeon Dr. Michael, and ask him to examine them for signs of augmentation. The video also includes a Q&A with the doctor about the risks, pain, and cost of augmentation, and ends with Kato explaining the Twitter post that started the controversy.

17 min read
0:04

Why Kato Says the Accusations Hurt

Kato opens by saying they are angry, which they describe as unusual for them. Their main objection is that people who do not know them are stating as fact that they had surgery. They argue the problem goes beyond influencers: the same people might say this about their own friends. Their advice to anyone who spreads rumors like this is to stop, because it "will lower your value."

Kato also tries to see where the suspicion comes from. Breast enhancement, they say, is a sensitive topic with a long history of false claims. Many people have bought expensive bust creams and supplements that did nothing, and some products marketed as "bust enhancement" were sold by people who had actually had surgery. Given that history, Kato says the skepticism is understandable, but it still hurts when people go too far.

They also offer a more positive reading. If people suspect surgery, it means Kato has changed a lot. They say that if they can make their method credible, they could help build a world where anyone can increase their bust size at home without going to a bust-up salon. For that reason, they decided to hold back their feelings and look for proof instead.

The immediate trigger was trouble on Twitter (X), which Kato blames partly on their own difficulty expressing themselves. They booked an appointment with Dr. Michael, whom they describe as a well-known breast augmentation surgeon. They say they asked him to examine them without bias and to tell viewers plainly if he found implants or fat augmentation. Filming took place at 9 p.m. on January 22.

2:04

Why a Mammogram Was Not Enough

Kato had already tried to answer the accusations by sharing a mammogram. Critics replied that silicone implants and hyaluronic acid show up on a mammogram, but fat augmentation does not. That is why Kato looked for a specialist.

At MYCLI, Kato says appointments are booked up to two years ahead and that two of their friends were happy with treatment there. Dr. Michael describes MYCLI as a specialized body clinic, though most of its body treatments involve the chest. He suggests two checks beyond mammography:

  • Ultrasound. He says ultrasound does not give a complete picture. However, if fat appears where there normally is none, the findings look different.
  • A body search for scars. Fat injection requires removing fat from somewhere else on the body, and that leaves small scars. The doctor says he can make a rough judgment from them.

Kato admits feeling nervous. They joke that after so much criticism, they had started to wonder whether they had somehow forgotten getting surgery, and say they were afraid of the result.

5:02

The Scar Check

Kato changes into the clinic's examination underwear and gown and goes into the operating room. Dr. Michael explains that a liposuction scar from fat augmentation is about 7mm long. Ordinary people would struggle to spot one, but as a plastic surgeon who also specializes in wounds, he says he is confident he can find it.

He checks Kato's whole body, starting with the feet, and reports that there is not a single scar. Kato takes this as proof that no liposuction was performed.

5:57

The Ultrasound Results

During the ultrasound, Dr. Michael explains what the image shows: fat near the surface, the mammary gland as a dark layer, and the pectoralis major muscle beneath it. Some people naturally have fat under the mammary gland. In fat augmentation, fat is injected into several layers, including the pectoral muscle. He compares the result to a mille-feuille.

He finds no injected fat in the right breast. In the left breast, he sees no fat under the mammary gland and no visible fat in the pectoral muscle. He also notes that Kato's pectoral muscles are thick. Kato replies that this comes from their training.

He carefully states the limits of his conclusion. A breast specialist could judge more accurately, and as a plastic surgeon rather than a breast surgeon, he says he cannot give a definitive diagnosis. From a plastic surgery perspective, he found no evidence of fat injection in Kato's body.

7:36

What the Doctor Said About Kato's Breast Shape

Kato asks what Dr. Michael made of the shape of their breasts, given that they say they tried to enlarge them through pectoral training and massage. He says breast shape and size depend on the mammary glands, fat, the base formed by the pectoral muscles, and the shape of the ribs. He thought Kato's pectoral muscles were thicker than the average woman's "in a good way," and that this thickness seemed to be affecting the shape of their chest. Kato's response: "My training paid off."

Kato then asks whether bust size can be increased at home. The doctor says the mammary glands stop growing after the secondary growth stage of puberty. However, he thinks working on the other factors can make the breasts bigger. He names posture as one of them, saying good posture improves blood circulation and helps nutrients reach the bust.

On aftercare following augmentation, he says that right after fat injection the clinic recommends rest so the fat can settle. Later on, he thinks training is a good idea, because posture affects how the breasts look.

9:26

Questions About Bounce, Ligaments, and Diet

Kato then asks questions they have raised in their own videos, plus questions from viewers.

Should you avoid letting your breasts bounce? Dr. Michael says there is no doubt that this is better. Cooper's ligaments hold the breast tissue together, and when they weaken under gravity, the breasts sag. Asked whether a torn Cooper's ligament grows back, he says that generally a torn ligament cannot regenerate.

Collagen and elastin. Since both are components of Cooper's ligaments, he says taking them may be effective.

Can diet increase bust size? Kato says their own bust grew because of the diet they chose. The doctor agrees that diet is related: the feeling of fullness in the breasts comes from mammary gland growth driven by female hormones, so foods related to female hormones can have an effect. He mentions soybeans as an example. When Kato asks whether people should eat foods that support the ovaries and female hormone production, he answers only that it "might work."

10:38

Kato's Position on Augmentation

After the examination, Kato stresses that they are not against breast augmentation. Their view is that people should first try training and dietary changes and treat surgery as a last resort. They call surgery risky and say cost and aftercare matter too, which is why they encourage people to do what they can on their own first. They add that if they ever wanted very large breasts like a gravure idol, they would ask Dr. Michael.

11:36

Risks of Silicone Implants and Fat Injection

Dr. Michael explains that the risks differ between silicone implants and fat injection.

Silicone implants. He calls it a mistake to say silicone implants must be replaced every 10 years; they need replacement if they break. He mentions the possibility of a lymphoma specific to silicone implants, though some aspects of it are not yet fully understood. Because the procedure is approved by medical associations, he describes the risks as present but minimal. He says there is no risk of internal bleeding with silicone implants if the correct procedure is followed. He also says a ruptured implant can cause a serious accident, and Kato notes that the doctor covers ruptures in detail on his own channel.

Fat injection. He says this is also a medically recognized treatment. Its main risk is that lumps can form if the fat is injected incorrectly or with the wrong method. Right after the procedure, the risks are internal bleeding and infection. He says the infection rate is very low and problems can be avoided if treated early, which is why follow-up matters.

13:22

Pain and Downtime

Kato asks how painful augmentation is, how long the pain lasts, and whether exercise hurts once the pain fades.

For silicone implants, Dr. Michael says there is severe pain for two to three days. With his clinic's minimal-downtime methods, he says the pain improves in about a week. Exercise such as jogging in the first month can make the implant rub and cause pain, so activity should be adjusted to the downtime period. Inserting an implant can also cause sharp, nerve-type pain, and nerve damage can make the nipples more sensitive, which he says improves within one to three months.

For fat injection, he says pain at both the injection site and the liposuction site peaks around the second or third day and improves in about a week, with internal bleeding visible. He emphasizes that these figures come from his patients' outcomes, not his own experience. Kato says they were surprised to learn that exercise is possible after silicone implants, and the doctor confirms it is.

14:34

Does Injected Fat Stay?

Kato asks whether injected fat disappears. Dr. Michael says no: once the fat cells survive and settle, they behave like normal body fat. Fat cells shrink as fat is burned through exercise, so the bust can get smaller with weight loss and return to its earlier size when weight comes back. Kato mentions a friend who had fat injections four times and whose bust still got smaller. The doctor says this depends on how the fat settles. Because it is the person's own fat, it grows or shrinks with weight and physiological changes. Asked about losing weight by not eating for several days, he says the breasts would lose volume just like the rest of the body.

15:06

Costs and "Hybrid" Augmentation

Dr. Michael gives the starting prices at his clinic:

  • Silicone implant surgery: from 1,006,200 yen
  • Hybrid augmentation: from 1,877,800 yen
  • Fat injection augmentation: from 683,600 yen

He explains that "hybrid" augmentation means adding fat injection on top of silicone implants. In this approach the implant determines the size range, so the achievable increase depends on the implant. Depending on how much the skin can stretch, he says bust size can increase by four to five cup sizes. Some patients who want very large breasts first get an implant to stretch the skin and then have a larger one inserted later. At his clinic, some patients received a 300–400cc implant the first time and an 800cc implant the second time.

For long-term care, he says fat injection needs little concern once the fat has settled, since it is the person's own tissue. Silicone implants generally do not break, but he recommends a checkup every 5 or 10 years. He adds that his clinic offers free ultrasound and medical checkups for life.

16:45

Will the Criticism Stop?

Back home, Kato says they are 100% certain they have never had augmentation and asks whether they will still face complaints. Someone off camera says they probably will, and that even people who watch this video might bring it up again six months from now. Kato says many of the critics are newcomers who do not know their history, and asks people to stop saying "breast augmentation" because it worries their fans, whom they call "MABUPINA."

Kato also mentions a video from three years ago in which they tried to prove the same thing: their breasts were compressed for an X-ray (they say they were flattened "like a curry bread"), which they describe as painful. They say they feel sorry for their own breasts and ask people to stop the criticism.

17:51

The Twitter Post Behind the Controversy

Kato then explains what set off this round of criticism. They had posted that "when the position of the bones changes, the position of the fat also changes." Doctors and other users quote-retweeted it, arguing that fat cannot be moved. Kato concedes that critics might say fat cannot be transferred from the thighs, back, or belly to the breasts, and says "that may be true." They also call some of the doctors "hyena-like" before admitting that may be an exaggeration. They attribute the controversy to their own poor wording and apologize to their fans, new viewers, and the doctors for causing concern.

Kato says their method is not about adding fat to the breasts. They are in the process of trademarking the word "KYOSEI," which they say means "to align the chest." The method aims to improve the shape of the bust so it looks bigger and forms "beautiful breasts." Kato argues that a good shape makes breasts look larger whether someone is a B or C cup. They also say that aligning the chest improves circulation, corrects the body's misalignments, removes stagnation, and helps nutrients travel more easily.

To clarify, Kato shows an image made by Dr. Fukky, who treats them at another clinic and who they say has worked as an anesthesiologist for about 10 years. According to Kato, Dr. Fukky saw the Twitter exchange, said the wording had been unclear, and made an illustration to explain it.

Kato explains the method this way. The foundation of the bust is the rib cage, so they aim to make it round by correcting distortions in the body's bones. Rounding the rib cage involves activating dormant deep inner muscles and using breathing to return each bone to its original position. When the body is straightened, sagging fat moves back into place, which Kato says creates a slimmer waist and firmer breasts. This is what they meant by "fat changes position." They say that after about a month of practice, the body is less likely to slip back into misalignment.

Kato describes the method as well-reasoned and says it has been reviewed by qualified chiropractors, acupuncturists, and physical therapists. They say they started from evidence-based practices, applied them to themselves, rebuilt their diet from scratch, and changed their bust that way. They hold back further details for an upcoming announcement.

21:34

Photos, Money, and Honesty

Kato wants to show before-and-after photos but has been told that some images would get them banned from YouTube. Instead, they say they are posting two unedited photos through their channel membership, one in the same underwear and one nude, which they say clearly show 100% that their body changed. They add that they did not want to undress for a doctor or talk publicly about their breasts just to prove they had no surgery.

They explain why they keep going: many people struggle with this issue, and a single session at a bust-up salon costs 30,000 to 40,000 yen. Kato says they researched many such salons and believe a salon-level result can be achieved at home. They also say there are "too many liars among influencers." Since they sell products and run a business themselves, they say they cannot stand people who make money by lying, and that refusing to do so is their personal rule.

Kato describes arguments with their brother, whom they call sensitive to others' feelings but also negative. The brother says that even if Kato changes the world, people will keep lying. Kato agrees that it is "100% impossible" to change other people or other influencers, who each have their own goals such as money or recognition. What they want to change, they say, is the experience of people who were deceived and hurt, so that those people can trust again and take another step forward. Kato says they want to be the first person who makes people who distrust the world feel they can trust it, and that they will never lie in order to get there. Whether selling products or posting online, they say their rule is that "it must be a win-win relationship."

Kato says they understand the feelings of the people who quote-retweeted them and promises to provide more reliable information. They tell supporters not to worry about them, acknowledge that some people still won't believe them, and say people should believe what they choose. The video ends with Kato saying that talking it through made them feel better and that they are preparing to present their method in full.