diff --git a/app/models/group.rb b/app/models/group.rb
index a7ad99f8c..ee2abfaad 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -1,6 +1,7 @@
 class Group < ActiveRecord::Base
   has_many :plans
   has_many :users
+  has_many :statistic_profiles
   has_many :trainings_pricings, dependent: :destroy
   has_many :machines_prices, -> { where(priceable_type: 'Machine') }, class_name: 'Price', dependent: :destroy
   has_many :spaces_prices, -> { where(priceable_type: 'Space') }, class_name: 'Price', dependent: :destroy
diff --git a/app/models/profile.rb b/app/models/profile.rb
index 57e2cfdb3..c9aaa6e13 100644
--- a/app/models/profile.rb
+++ b/app/models/profile.rb
@@ -14,7 +14,8 @@ class Profile < ActiveRecord::Base
   validates :birthday, presence: true
   validates_numericality_of :phone, only_integer: true, allow_blank: false
 
-  after_save :update_invoicing_profile
+  after_save :update_invoicing_profile, if: invoicing_data_was_modified?
+  after_save :update_statistic_profile, if: statistic_data_was_modified?
 
   def full_name
     # if first_name or last_name is nil, the empty string will be used as a temporary replacement
@@ -51,6 +52,14 @@ class Profile < ActiveRecord::Base
 
   private
 
+  def invoicing_data_was_modified?
+    first_name_changed? or last_name_changed? or new_record?
+  end
+
+  def statistic_data_was_modified?
+    birthday_changed? or gender_changed? or new_record?
+  end
+
   def update_invoicing_profile
     if user.invoicing_profile.nil?
       InvoicingProfile.create!(
@@ -66,4 +75,19 @@ class Profile < ActiveRecord::Base
     end
   end
 
+  def update_statistic_profile
+    if statistic_profile.nil?
+      StatisticProfile.create!(
+        user: user,
+        birthday: birthday,
+        gender: gender
+      )
+    else
+      statistic_profile.update_attributes(
+        birthday: birthday,
+        gender: gender
+      )
+    end
+  end
+
 end
diff --git a/app/models/statistic_profile.rb b/app/models/statistic_profile.rb
new file mode 100644
index 000000000..2c88d7bfa
--- /dev/null
+++ b/app/models/statistic_profile.rb
@@ -0,0 +1,6 @@
+class StatisticProfile < ActiveRecord::Base
+  belongs_to :user
+  belongs_to :group
+
+  # relations to reservations, trainings, subscriptions
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 574b4c9b7..d18e7fea9 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -24,6 +24,9 @@ class User < ActiveRecord::Base
   has_one :invoicing_profile, dependent: :nullify
   accepts_nested_attributes_for :invoicing_profile
 
+  has_one :statistic_profile, dependent: :nullify
+  accepts_nested_attributes_for :statistic_profile
+
   has_many :my_projects, foreign_key: :author_id, class_name: 'Project', dependent: :destroy
   has_many :project_users, dependent: :destroy
   has_many :projects, through: :project_users
@@ -63,7 +66,8 @@ class User < ActiveRecord::Base
   after_commit :create_stripe_customer, on: [:create]
   after_commit :notify_admin_when_user_is_created, on: :create
   after_update :notify_group_changed, if: :group_id_changed?
-  after_save :update_invoicing_profile
+  after_save :update_invoicing_profile, if: invoicing_data_was_modified?
+  after_save :update_statistic_profile, if: statistic_data_was_modified?
 
   attr_accessor :cgu
   delegate :first_name, to: :profile
@@ -362,10 +366,19 @@ class User < ActiveRecord::Base
                             attached_object: self
   end
 
+  def invoicing_data_was_modified?
+    email_changed? or new_record?
+  end
+
+  def statistic_data_was_modified?
+    group_id_changed? or new_record?
+  end
+
+
   def update_invoicing_profile
     if invoicing_profile.nil?
       InvoicingProfile.create!(
-        user: user,
+        user: self,
         email: email
       )
     else
@@ -374,4 +387,17 @@ class User < ActiveRecord::Base
       )
     end
   end
+
+  def update_statistic_profile
+    if statistic_profile.nil?
+      StatisticProfile.create!(
+        user: self,
+        group_id: group_id
+      )
+    else
+      statistic_profile.update_attributes(
+        group_id: group_id
+      )
+    end
+  end
 end
diff --git a/db/migrate/20190603150642_create_statistic_profile.rb b/db/migrate/20190603150642_create_statistic_profile.rb
new file mode 100644
index 000000000..68106a700
--- /dev/null
+++ b/db/migrate/20190603150642_create_statistic_profile.rb
@@ -0,0 +1,10 @@
+class CreateStatisticProfile < ActiveRecord::Migration
+  def change
+    create_table :statistic_profiles do |t|
+      t.boolean :gender
+      t.date :birthday
+      t.belongs_to :group, index: true, foreign_key: true
+      t.belongs_to :user, index: true, foreign_key: true
+    end
+  end
+end
diff --git a/db/migrate/20190603151142_feed_statistic_profile.rb b/db/migrate/20190603151142_feed_statistic_profile.rb
new file mode 100644
index 000000000..71ceafac0
--- /dev/null
+++ b/db/migrate/20190603151142_feed_statistic_profile.rb
@@ -0,0 +1,15 @@
+class FeedStatisticProfile < ActiveRecord::Migration
+  def change
+    User.all.each do |u|
+      p = u.profile
+      puts "WARNING: User #{u.id} has no profile" and next unless p
+
+      StatisticProfile.create!(
+        user: u,
+        group: u.group,
+        gender: p.gender,
+        birthday: p.birthday
+      )
+    end
+  end
+end