Sitting for long periods and having low daily activity are common lifestyle patterns among many office workers and homemakers in Hong Kong.

You commute to work sitting down, spend hours at the office seated, continue sitting after lunch, then get home tired and just want to rest after dinner. Over time, many people start to feel:

“I seem to gain weight more easily now.”
“I used to eat the same amount without getting as much belly fat.”
“Has my metabolism slowed down?”

What people describe as “slow metabolism” does not always mean there is a metabolic disorder. More commonly, it can be related to low total daily activity, insufficient muscle stimulation, prolonged sitting, plus frequent eating out, rice and noodles, sweet drinks and high-fat foods — all of which can reduce overall energy expenditure.

So if you want to start a 30-day fat-loss plan, the most practical approach is not to run 10 kilometres on Day 1 or suddenly cut out rice and noodles completely.

A better approach is to divide the plan into three parts:

Training + Daily Activity + Dietary Management

This is where Dr. Serum Silk Fibroin Jelly can fit into the “pre-meal dietary management” part of the plan. The product comes in individually packed ready-to-eat Jelly sachets, is mainly taken before meals, and the general recommendation is 3 packs per day — 1 before each meal — with no water required.

Below is a 30-day beginner plan designed for people who have been inactive for a long time, sit for extended periods and have a relatively low fitness base.

Why Can Long-Term Inactivity Make You Feel Like Your “Metabolism Is Getting Slower”?

If someone spends most of the day sitting, the most immediate issue is usually:

Lower Total Daily Energy Expenditure.

For example, maybe you used to:

• Walk to work

• Move around a lot

• Stand frequently

• Exercise regularly

But later your routine became:

• Sitting during the commute

• Sitting 8–10 hours in the office

• Sitting while eating

• Watching your phone or TV at night

• Almost no formal exercise during the week

Even if your food intake has not increased much, lower daily activity can still make weight management more difficult.

Long-term lack of strength training also means your muscles receive less stimulation.

So for this type of person, the first goal of a 30-day plan should not be:

“I must lose X kg in 30 days.”

It should be:

Rebuild daily activity + establish a regular training habit.

Once these two are in place, it becomes much easier to continue into Day 60 and Day 90.

30-Day Fat-Loss Training Plan Overview

If you have not exercised for a long time, you can divide the 30 days into 4 stages:

The key is:

Increase only a little each week.

If you go from doing nothing to one hour of HIIT every day, the most likely result is not “your metabolism shoots up”.

It is:

You feel sore all over on Day 2 and lose motivation by Day 3.

Day 1–7｜Wake Up Your Activity Level

You do not need high intensity in the first week.

There are only two goals:

Walk More Every Day + Do 2 Simple Workouts Per Week

Daily Activity

You can start with:

• Walk 10–15 minutes after meals

• Stand up and move for 2–3 minutes every 45–60 minutes of sitting

• Take the stairs for 1–2 floors

• Take a short walk after lunch

• Get off one stop earlier after work

If you normally walk only 3,000–4,000 steps per day, there is no need to force yourself to hit 10,000 immediately.

Instead, aim for:

1,000–2,000 More Steps Per Day Than Usual

That is usually easier to maintain.

2 Beginner Workouts Per Week

Each session: around 15–20 minutes

Squat
8–12 reps × 2 sets

Glute Bridge
10–15 reps × 2 sets

Wall Push-up
8–12 reps × 2 sets

Bird Dog
8–10 reps each side × 2 sets

Plank
15–30 seconds × 2 sets

If you finish and still feel like you have some energy left, that is completely normal.

The goal of Week 1 is not to exhaust yourself.

It is:

Let Your Body Get Used to Moving Again.

Day 8–14｜Add Basic Strength Training

By Week 2, if you have started adapting to Week 1, you can increase strength training to:

2–3 Times Per Week

Each session: around 20–30 minutes.

You can do:

Lower Body

• Squat 10–12 reps × 3 sets

• Glute Bridge 12–15 reps × 3 sets

• Reverse Lunge 8–10 reps each side × 2 sets

Upper Body

• Wall / Incline Push-up 8–12 reps × 3 sets

• Bent-over Row with Water Bottles 10–12 reps × 3 sets

Core

• Dead Bug 8–10 reps each side × 2 sets

• Plank 20–30 seconds × 2–3 sets

Keep up your daily walking at the same time.

At this stage, there is no need to chase a “sweaty workout”.

What matters most in strength training is:

Good Movement Quality + Gradually Increasing the Challenge.

Day 15–21｜Strength + Walking Together

By Week 3, you can aim for:

3 Strength Sessions Per Week

And add:

2–4 Days of Brisk Walking for 20–30 Minutes

If your fitness allows, walk a little faster.

You do not need to run.

A simple way to judge the intensity is:

Your breathing is faster, but you can still speak in short sentences.

This level is usually more manageable for people who have been inactive for a long time.

You can continue using:

• Squat

• Reverse Lunge

• Glute Bridge

• Row

• Incline Push-up

• Plank

• Dead Bug

If bodyweight exercises already feel too easy, you can:

• Hold water bottles

• Add a small amount of weight to a backpack

• Add 1 extra set

• Add 2–3 reps per set

Increase gradually.

Day 22–30｜Build a Routine You Can Keep Going

In the final week, many people think:

“I need to push much harder for the last 7 days.”

Not necessarily.

What matters more is turning the plan into a routine you can continue afterwards.

A weekly structure can look like:

3 Days of Strength Training

25–40 minutes each time.

2–4 Days of Walking / Low-Impact Cardio

20–40 minutes each time.

Reduce Long Periods of Sitting Every Day

For example, stand up and move for a few minutes every hour.

If you can do this, the 30-day plan stops being:

“A One-Month Challenge”

and starts becoming:

A New Lifestyle Habit.

How Should You Eat During the 30 Days? You Don’t Need to Quit Rice, but You Do Need to Adjust the Balance

If you have been inactive for a long time and suddenly start exercising, one common problem is:

“I exercised, so I can eat more.”

The result is that your energy expenditure increases a little, but your food intake increases even more.

So during the 30-day plan, you still need a basic dietary structure.

A simple meal formula is:

Vegetables + Protein + A Moderate Portion of Staple Carbs

For example:

Vegetables
Spinach, broccoli, choy sum, gourds

Protein
Fish, chicken, eggs, tofu, lean meat

Staple Carbs
Rice, noodles, rice noodles, potatoes

You do not need to eliminate rice completely.

But you can change from:

A Large Bowl of Rice

to:

A Moderate Portion of Rice + More Vegetables + Enough Protein

Also reduce:

• How often you eat fried food

• Heavy sauces

• Sweet drinks

• Afternoon tea desserts

• Late-night snacks

• Alcohol

For Hong Kong people who often eat at cha chaan tengs or order takeaway, you do not need every meal to be “100% perfect”.

A more realistic goal is:

Make Each Meal 20% Better Than Before.

How to Combine Dr. Serum Silk Fibroin Jelly with a 30-Day Plan

Dr. Serum fits best into the:

Dietary Management Part of the Plan.

It is not a replacement for exercise.

And taking Jelly does not mean you can completely ignore your diet.

Dr. Serum is positioned as:

A Pre-Meal Dietary / Weight-Management Jelly Used Alongside Normal Eating

It is not a meal replacement, crash diet plan, appetite suppressant, laxative or weight-loss drug.

Its core ingredient is:

Silk Fibroin

Silk Fibroin has a fine, porous, mesh-like structure.

A simple way to picture it is as a fine:

“Net / Sponge-Like Structure”

The product uses this structure together with the concept of physically adsorbing part of the fat and sugar from food as part of pre-meal dietary management.

In simple terms:

Take Dr. Serum Jelly Before a Meal
↓
Silk Fibroin’s Porous / Mesh-Like Structure
↓
The Brand Describes It as Physically Adsorbing Part of the Fat and Sugar From Food
↓
Supports Everyday Dietary / Weight Management

The current general usage is:

• 1 pack before breakfast

• 1 pack before lunch

• 1 pack before dinner

That means:

3 Packs Per Day

The product comes in individually packed ready-to-eat Jelly sachets, so you can tear one open and eat it directly without water.

For people who eat out frequently, have cha chaan teng lunches, order takeaway for dinner, and cannot always control how food is cooked, this type of pre-meal routine can be easier to fit into normal life.

Sample Day: How Can a Sedentary Office Worker Structure It?

Let’s say you work 9–6 and normally exercise very little.

Breakfast

Before Breakfast: Dr. Serum 1 Pack

Eat a normal breakfast, but watch the portion.

For example:

Eggs + Toast + Unsweetened Drink

instead of:

Pineapple Bun with Butter + Noodles with Luncheon Meat and Egg + Sweet Milk Tea all at once.

Morning

Every 45–60 minutes of sitting:

Stand Up and Move for 2–3 Minutes

Refill your water, go to the bathroom or take a short walk.

Lunch

Before Lunch: Dr. Serum 1 Pack

At a cha chaan teng, you can choose:

Less rice, less sauce, more vegetables.

After lunch:

Walk for 10–15 Minutes

After Work

If it is a training day:

Do 20–40 minutes of strength training.

If it is not a training day:

Do 20–30 minutes of brisk walking.

Dinner

Before Dinner: Dr. Serum 1 Pack

Eat normally with your family.

There is no need to prepare a separate diet meal.

Track 5 Indicators Instead of Only Weighing Yourself Every Day

During the 30 days, you can track:

1. Body Weight

Measure 1–2 times per week, at a similar time.

2. Waist Measurement

For example: Day 1, Day 15 and Day 30.

3. Daily Steps / Activity Level

See whether you are genuinely moving more than before.

4. Number of Workouts

For example:

“I completed 3 strength sessions this week.”

5. Clothing Fit / Progress Photos

Sometimes body weight may not change much, but your waistband or waistline may feel different first.

The goal is not to chase a perfect number every day.

What matters is:

Whether Your Lifestyle Has Actually Changed After 30 Days.

Common Fat-Loss Mistakes Among Long-Term Sedentary People

1. Starting With High-Intensity Exercise on Day 1

Going from zero exercise to one hour of HIIT, running or skipping can make you excessively fatigued.

Beginners are better off progressing gradually.

2. Completely Cutting Out Carbs

Eating too little in the short term can lead some people to overeat later.

Portion control is usually more practical than total restriction.

3. Doing Only Cardio and No Strength Training

Walking and running are useful.

But if you want to improve body shape and physical function long term, strength training is also worth including.

4. Thinking Supplements Mean You Can Eat Anything

Dr. Serum can be part of pre-meal dietary management, but that does not mean calories, fat and sugar no longer matter.

The product is designed to support management, not replace lifestyle habits.

30-Day Fat-Loss Plan FAQ

If I Haven’t Exercised for a Long Time, How Many Days a Week Should I Train?

Beginners can start with 2 strength-training sessions per week.

Once you adapt, increase to 3.

On other days, use walking and general daily movement to stay active.

I Really Feel Like My Metabolism Is Very Slow. What Should I Do?

Feeling like your metabolism is slow can be related to low activity, prolonged sitting, insufficient muscle stimulation and sleep, but you should not assume you have a metabolic disorder based on feeling alone.

If you have significant, persistent and unexplained weight changes, or other physical symptoms at the same time, speak with a qualified healthcare professional.

How Many Kilograms Can I Definitely Lose in 30 Days?

There is no fixed number that applies to everyone.

Actual changes depend on your starting weight, diet, activity level, sleep, physical condition and how consistently you follow the plan.

Instead of chasing a “must lose X kg in 30 days” target, it is more useful to track waist measurement, steps, training frequency and lifestyle habits.

Can Dr. Serum Increase Metabolism?

Dr. Serum is not positioned as a metabolism-boosting product.

It is a pre-meal dietary / weight-management Jelly that uses Silk Fibroin’s porous / mesh-like structure together with the brand concept of physically adsorbing part of the fat and sugar from food to support everyday dietary management.

So discussing “slow metabolism” in this article does not mean Dr. Serum has a metabolism-boosting effect.

Do I Only Need Dr. Serum on Workout Days?

No.

Dr. Serum is used as part of pre-meal dietary management, not as a pre-workout supplement.

The current general usage is 3 packs per day, 1 before each meal.

Can I Follow This 30-Day Plan If I Have No Exercise Background at All?

You can start with the lower-intensity version in Week 1.

If you have cardiovascular disease, joint problems, chronic health conditions, or have not exercised for a long time and are unsure about exercise safety, check with a doctor or qualified exercise professional before starting a new training plan.

Conclusion: A Good 30-Day Plan Is Not About Pushing as Hard as Possible for 30 Days — It’s About Still Being Able to Continue Afterwards

For people who have been inactive for a long time, sit all day at work and feel that their “metabolism is slow”, the easiest mistake to make is:

Doing Too Much Too Suddenly.

Extreme dieting.

Training hard every day.

Expecting a huge transformation within one week.

A more practical 30-day fat-loss plan looks like this:

✅ Increase daily activity first in Week 1
✅ Gradually build up to 2–3 strength sessions per week
✅ Add brisk walking or low-impact cardio
✅ Keep rice and noodles, but adjust portions
✅ Reduce how often you eat high-fat and high-sugar foods
✅ Avoid sitting for long periods without moving
✅ Track waist measurement, steps and training frequency together
✅ If you eat out often, build a consistent pre-meal management habit

The role of Dr. Serum Silk Fibroin Jelly in the overall plan is not to replace training.

And it is not a “metabolism-boosting miracle”.

It fits better into:

Dietary Management Before Your Normal Meals.

The product is a ready-to-eat Jelly taken before meals, with Silk Fibroin as its core ingredient, combined with the brand-described concept of physically adsorbing part of the fat and sugar from food as one part of everyday dietary and weight management.

So the entire 30-day direction can be summed up as:

Move More + Build Strength + Eat Sensibly + Manage Before Meals

If, after 30 days, you have gone from “barely moving at all” to training regularly every week, walking more every day, making better choices when eating out, and building a consistent pre-meal routine, that change itself is far more valuable than any “7-day quick fix”.