Yes I can do it 3-4 weeks. Strict keto. No bread pasta, potato, rice, sugar (including most fruit) or sweet things.
Breakfast - Plain full fat yoghurt with nuts and raspberries for breakfast (no sweetener) OR eggs/bacon omelette. No dressings or sauces or bread.
Lunch - keto soup. So cream of mushroom, chicken, etc. OR salad with egg/cheese/meat and olive oil dressing.
Dinner. Any meat/veg combo. Meat stir-fry, spicy chicken, creamy salmon.
Snacks, boiled eggs, 2 squares of dark chocoate.
Aim for less then 5g carbs per 100g.
The first week will be rough, you will feel like you have a bad cold. Shaky, headache. Drink plenty of water, salt your food. Weeks 2 onwards gets better and better.