Fifteen pounds in four weeks is aggressive but achievable for someone starting with 20 lbs or more to lose, and only with a plan that respects your muscle, sleep, and mental health. A slower, forever pace will always beat a crash and rebound. This four-week framework is built to be the start of that forever pace, not a one-off stunt.

Before you start: a realistic expectation

Of the first fifteen pounds lost quickly, five to eight will be water and stored glycogen. The remainder is fat. That's normal. The water returns when you start eating maintenance calories again. What matters is the trend line over months, not the first scale reading.

Set your calorie target in two minutes

A safe, aggressive deficit is 25% below maintenance. Use this quick estimate:

• Bodyweight in lbs × 12 = maintenance calories
• Maintenance × 0.75 = your daily target

For a 200-lb person, that's roughly 1,800 calories per day. Don't go below 1,500 for women or 1,700 for men without a clinician.

Hit protein every day, non-negotiable

Target one gram of protein per pound of goal weight. For most readers that's 130–180 grams a day. Build your meals around it — eggs, Greek yogurt, chicken, fish, tofu, lentils, a nightly protein shake if the day is short.

The meal template

Four meals, same structure every day until it feels effortless.

• Breakfast: 30–40 g protein + 1 piece of fruit + black coffee or green tea.
• Lunch: 30–40 g protein + two large handfuls of vegetables + a palm-sized portion of carbs (rice, quinoa, potato, legumes).
• Afternoon snack: 20–30 g protein (Greek yogurt, a shake, or cottage cheese).
• Dinner: 40 g protein + three large handfuls of vegetables + a small portion of healthy fats (olive oil, avocado, nuts).

Drink three litres of water daily. Zero calorie drinks are fine. No juice, no sugary drinks, no alcohol for these four weeks.

Weekly training split

Four strength sessions and five walks a week. Ninety-minute total commitment per week for lifting; walks can overlap with commute or phone calls.

• Monday: Full-body strength (squat, row, press) — 45 min
• Tuesday: 45–60 minute brisk walk
• Wednesday: Full-body strength (deadlift, pull-up, push-up) — 45 min
• Thursday: 45–60 minute walk
• Friday: Full-body strength (lunge, row, shoulder press) — 45 min
• Saturday: Long walk, 60+ minutes, or a recreational sport you enjoy
• Sunday: Optional short mobility session or full rest

Sleep, tracked

Seven and a half to eight hours, same bedtime, same wake time. Put the phone in another room. This is not optional — sleep is where fat loss actually happens.

Weekly check-in, not daily

Weigh every morning, average the seven days, compare week to week. Measure your waist once a week. Take a progress photo in the same light once a week. If the weekly average hasn't moved after two weeks, drop another 150 calories.

What to do in week five

Don't stop the plan — evolve it. Add 200 calories back in the form of more protein and more fibrous vegetables, keep the training, keep the sleep, keep the walking. That's how you keep the fifteen pounds off instead of finding them again in six weeks.

Losing weight quickly is not the hard part. The hard part is building a life that doesn't require repeating the exercise every spring. This plan is meant to be the first four weeks of that life — not the whole of it.