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Love on a Diet (2001) movie poster

Plot Summary

Love on a Diet (2001) Plot Summary Explained

Release, runtime and language
2001 · 94 mins · Cantonese
Directed by
Johnnie To, Wai Ka-Fai
Starring
Andy Lau, Lam Suet, Lu Ching-Ting, Ryuji Yamamoto, Sammi Cheng Sau-Man, Hung Wai-Leung

A depressed, obese woman tries to lose weight in order to win back her ex-boyfriend with the help of a fellow Hong Konger whom she met in Japan.

On this page (5)
  1. 1 What happens: full plot
  2. 2 Plot questions answered
  3. 3 Movie threads
  4. 4 Movies like Love on a Diet
  5. 5 Every angle

Full plot summary · contains spoilers

What Happens in Love on a Diet: Full Plot Summary

The whole story of Love on a Diet (2001) explained, from the opening scene to the final frame: every key event, every twist and what it all adds up to. Read it as a quick recap before the sequel, to check a scene you missed, or to finally understand what really happened.

Mini Mo Sammi Cheng Sau-Man is a Hong Kong resident living in Japan. She battles depression, low self-esteem, and a binge eating disorder that has left her severely obese. A suicide attempt brings her into contact with Fatso Andy Lau, a Hong Kong salesman working in Japan who is also obese.

Mini sticks with Fatso everywhere, and although he is initially irritated by her constant presence, he comes to understand the deeper reasons behind her pain. Mini cannot forget her former boyfriend, Kurokawa Rikiya Kurokawa, who is now a world-famous pianist. Ten years ago, the two had pledged to meet at the foot of Yokohama Marine Tower on the night of their break-up. Mini is fearful of meeting Kurokawa in her current size, but Fatso is moved by her story and vows to help her.

After a string of desperate weight-loss attempts—swallowing tapeworms and sweating through Dance Dance Revolution—Mini begins to shed pounds. Yet Fatso’s funds are running low. To finance Mini’s transformation, he launches a street boxing gig, inviting onlookers to punch him as a way to vent their frustrations. He then enrolls Mini in an expensive weight-loss program, and the plan proves to be incredibly effective. Mini regains her former slim and pretty look.

On the night of her reunion with Kurokawa, Fatso drops Mini off at Tokyo Tower, where she meets her ex beau under the watchful eyes of the local media. The pair are interviewed by a network, but Mini notices another broadcast featuring Fatso’s street boxing gig. She realizes how much Fatso has sacrificed for her, and is moved to tears. Turning to apologize to Kurokawa, she leaves hastily.

Months later, Mini publishes a dieting bestseller, and spots a slimmed-down Fatso carrying her book in a park. The two share a kiss, promising never to leave each other again.

Last updated: October 09, 2025 at 16:40

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Plot questions answered

Love on a Diet Plot Explained: Your Questions Answered

The questions people ask most about Love on a Diet (2001): what happens in the confusing scenes, why the characters do what they do, the twists, hidden details and what the ending means. Each answer contains spoilers.

Q1

Why does Mini want to lose weight?

Mini wants to lose weight to win back her ex-boyfriend Kurokawa, who is now a world-famous pianist. She fears facing him in her current size and wants to restore her former appearance before approaching him again.

Foreshadowing: Earlier scenes show Mini's deep insecurity about her appearance and her inability to forget Kurokawa, establishing why regaining her slim figure feels essential to her.

  • mini
  • kurokawa
  • weight loss
  • ex-boyfriend
  • motivation
Q2

What was the promise at Yokohama Marine Tower?

Ten years before the story, Mini and Kurokawa pledged to meet at the foot of Yokohama Marine Tower on the night of their break-up. This unresolved promise haunts Mini throughout the film and becomes the driving goal behind her transformation.

Foreshadowing: The flashback in timeline item 3 establishes this pivotal memory that shapes Mini's emotional journey.

  • yokohama marine tower
  • promise
  • kurokawa
  • breakup
  • flashback
Q3

Why does Fatso let people punch him on the street?

Fatso starts a street boxing gig to raise money for Mini's weight-loss journey. With his funds running low, he invents this unusual fundraising method where onlookers pay to vent their frustrations by punching him. The money finances Mini's expensive weight-loss program.

Foreshadowing: Timeline item 7 shows this sacrifice directly enables Mini's enrollment in the costly program that finally works.

  • fatso
  • street boxing
  • fundraising
  • money
  • sacrifice
Q4

Why does Mini leave Kurokawa at Tokyo Tower?

During her reunion with Kurokawa, Mini sees a TV broadcast showing Fatso's street boxing gig. She realizes how much Fatso has sacrificed for her and understands his genuine love. Overcome with emotion and gratitude, she abandons her plan to win back Kurokawa and chooses to pursue a future with Fatso instead.

Foreshadowing: This moment connects directly to earlier scenes where Fatso's dedication was established but not yet fully appreciated by Mini.

  • mini
  • kurokawa
  • fatso
  • choice
  • tokyo tower
  • sacrifice
Q5

Why does Mini try swallowing tapeworms?

Mini resorts to extreme and dangerous methods in her desperate attempt to lose weight quickly. Swallowing tapeworms is one of her first extreme measures, highlighting the desperation and emotional turmoil driving her weight-loss journey before she finds a more sustainable program.

Foreshadowing: This desperation establishes the stakes and emotional vulnerability that make Fatso's later support so meaningful.

  • tapeworms
  • extreme weight loss
  • desperation
  • methods
Q6

How does Mini lose weight so quickly?

After her extreme attempts fail to produce sufficient results, Fatso enrolls Mini in an expensive weight-loss program. This professional program proves highly effective and helps her regain her former slim figure, setting the stage for her reunion with Kurokawa.

Foreshadowing: The timeline shows this program follows directly after Fatso's fundraising efforts, making his sacrifice the key enabler.

  • weight loss program
  • effective
  • transformation
  • fast
Q7

Who is Fatso and why does he help Mini?

Fatso is a Hong Kong salesman living in Japan who, like Mini, struggles with obesity. After meeting Mini following her suicide attempt, he becomes her supporter and eventually her love interest. Moved by her story about Kurokawa and the Yokohama promise, he vows to help her transform.

Foreshadowing: The initial meeting establishes their parallel situations, making Fatso's empathy and later sacrifice feel natural.

  • fatso
  • andy lau
  • support
  • helper
  • obesit
Q8

What happens at Tokyo Tower on reunion night?

Fatso drops Mini off at Tokyo Tower for her reunion with Kurokawa. The media captures the famous pianist being interviewed, creating a public spectacle. However, during the interviews, Mini spots the broadcast about Fatso's boxing gig, realizes his sacrifice, and dramatically changes her plans.

Foreshadowing: This pivotal moment fulfills the buildup from Fatso's earlier fundraising efforts and Mini's internal conflict about her ex.

  • tokyo tower
  • reunion
  • kurokawa
  • media
  • broadcast
Q9

Why does Mini publish a dieting book?

After her transformation, Mini publishes a dieting bestseller sharing her personal journey and the lessons she learned about overcoming depression and binge eating. The book represents her complete transformation from a suicidal, insecure woman to someone who has reclaimed her life and identity.

Foreshadowing: This success is the culmination of the physical and emotional journey she underwent with Fatso's support.

  • dieting book
  • author
  • success
  • transformation
  • publish
Q10

What happens to Fatso by the end of the movie?

By the end, Fatso has also lost weight and transformed physically. Months after the Tokyo Tower events, Mini spots him carrying her published book in a park. They reunite, share a kiss, and vow never to leave each other again, completing both their physical and emotional journeys.

Foreshadowing: The ending mirrors Mini's transformation, showing that their relationship inspired mutual change.

  • fatso
  • transformation
  • slim
  • kiss
  • ending
  • reunion

Movie threads

More Movies Like Love on a Diet, by Mood & Story

Curated lists built around what makes Love on a Diet tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Movies with a friends-to-lovers arc like Love on a Diet

Stories where deep support between friends blossoms into a powerful, earned love. If you liked seeing the supportive friendship evolve into romance in Love on a Diet, you'll enjoy these movies. They feature similar narratives where characters build a profound connection through mutual aid before discovering deeper feelings, offering a heartwarming and believable love story.

  • romantic
  • supportive
  • uplifting
  • heartfelt
  • sweet
  • emotional
  • Tone: hopeful, supportive, romantic
  • Pacing: steady, character-driven
Why these movies?

The story pattern: Narratives in this thread typically begin with two individuals forming a bond based on support, mentorship, or a shared goal, not romantic intent. The plot focuses on their collaborative efforts to overcome an obstacle, during which their understanding and care for each other grow. The romantic feelings emerge gradually, often as a surprise to the characters themselves, resolving the central conflict with a partnership built on a solid foundation of friendship.

Why they belong together: Movies are grouped here because they share the core emotional arc of a relationship evolving from selfless friendship into romantic love. They emphasize the theme that the strongest romances are often built on a bedrock of trust, sacrifice, and shared experience, creating a deeply satisfying and hopeful viewing experience.

Movies about uplifting personal transformations like Love on a Diet

Emotional stories about overcoming personal lows to build a better, happier life. Fans of Love on a Diet's story of overcoming depression and low self-esteem will find similar inspiring tales here. These movies share a focus on hopeful, motivational journeys where characters actively work to reinvent themselves, often with the help of a supportive friend, resulting in a happy and cathartic ending.

  • uplifting
  • motivational
  • melancholic
  • sympathetic
  • heartwarming
  • inspiring
  • Tone: hopeful, melancholic, motivational
  • Pacing: steady, methodical
Why these movies?

The story pattern: The narrative pattern involves a character at a significant emotional low, grappling with issues like poor self-image or unrequited love. The plot is driven by their decision to take control and pursue a tangible goal for self-improvement. The journey is challenging and has melancholic moments, but the overall tone is hopeful, focusing on progress and small victories, culminating in a success that is both external (achieving the goal) and internal (gaining self-worth).

Why they belong together: These movies are grouped together because they blend a serious, sometimes melancholic starting point with an overwhelmingly hopeful and uplifting trajectory. They offer a motivating experience, showing that positive change is possible through perseverance and support, making them ideal for viewers seeking stories of resilience and emotional triumph.

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Every angle

Love on a Diet (2001) Explained: Plot, Timeline & Characters

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