My diet please help

[Aussie-bum]

Hey guys this is my current diet i was wondering if anyone could give me some help i have been losing lean mass for almost a month now at a steady rate and don?t know how to stop it i seem to be consuming enough to what i read and what i can stomach. Dinner is an underestimate due to father-in-law cooking and would be pretty insulted if i said no but large portion of meat or fish with lots of vegies and potatoe, sweet potatoe, pasta or brown rice so in the end not to bad he is just a fan of olive oil but goes easy on mine any help would be awesome.

Breakfast 6:00
Special K 100g lite Milk 250mls Honey 30g
1 flax seed tablet 1 Salmon oil tablet

Protein 29.5 Grams
Fat Total 3.9 Grams
Saturated 1.5 Grams
Carbohydrates 113.6 Grams
Sugars 53.7 Grams

Calories 604

Morning Meal 9:00
Steak 200g Brown Rice 100g

Protein 54.8 Grams
Fat Total 8 Grams
Saturated 4 Grams
Carbohydrates 71 Grams
Sugars 1 Grams

Calories 586

Lunch Meal 12:00
1 flax seed tablet 1 Salmon oil tablet
Museli 200g Lite Milk 400mls

Protein 35.4 Grams
Fat Total 19.8 Grams
Saturated 6.8 Grams
Carbohydrates 171.8 Grams
Sugars 81.6 Grams

Calories 1046

Afternoon Meal 3:00
Chicken 200g Pasta 125g

Protein 68.2 Grams
Fat Total 8.4 Grams
Saturated 4 Grams
Carbohydrates 92 Grams
Sugars 1 Grams

Calories 675
Post Gym 7:00

Musashi P40

Protein 40.0 Grams
Fat Total 1.5 Grams
Saturated 1.0 Grams
Carbohydrates 37.0 Grams
Sugars 24.0 Grams

Calories 498.6
Dinner 9:00
1 flax seed tablet 1 Salmon oil tablet

Protein 40 Grams
Fat Total 36 Grams
Saturated 8 Grams
Carbohydrates 54 Grams
Sugars 5 Grams

Calories 700
Total daily Values

Calories 4110
Protein 268
Fat 78
Carbs 540